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OBJECTIVES: The objective of this study was to explore the factors and outcomes associated with gestational syphilis in Peru. METHODS: Women from the miscarriage, vaginal delivery, and C-section wards from a large maternity hospital in Lima with or without syphilis diagnosis were enrolled and their pregnancy outcomes compared. Maternal syphilis status using maternal blood and child serostatus using cord blood were determined by rapid plasma reagin (RPR) and rapid syphilis tests. The newborns' clinical records were used to determine congenital syphilis. RESULTS: A total of 340 women were enrolled, 197 were positive and 143 were negative for RPR/rapid syphilis tests. Antibody titers in sera from cord and maternal blood were comparable with RPR titers and were highly correlated (rho = 0.82, P <0.001). Young age (P = 0.009) and lower birth weight (P = 0.029) were associated with gestational syphilis. Of the women with gestational syphilis, 76% had received proper treatment. Mothers of all newborns with congenital syphilis also received appropriate treatment. Treatment of their sexual partners was not documented. CONCLUSIONS: Syphilis during pregnancy remains a major cause of the fetal loss and devastating effects of congenital syphilis in newborns.
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Complicações Infecciosas na Gravidez , Sífilis Congênita , Sífilis , Humanos , Feminino , Gravidez , Peru/epidemiologia , Sífilis Congênita/epidemiologia , Sífilis Congênita/diagnóstico , Adulto , Complicações Infecciosas na Gravidez/epidemiologia , Complicações Infecciosas na Gravidez/microbiologia , Estudos Prospectivos , Recém-Nascido , Sífilis/epidemiologia , Sífilis/diagnóstico , Adulto Jovem , Resultado da Gravidez/epidemiologia , Transmissão Vertical de Doenças Infecciosas , Sorodiagnóstico da Sífilis , Adolescente , Sangue FetalRESUMO
ABSTRACT Background: Helicobacter pylori infection is widely spread globally and is known to cause potentially serious diseases. Several diagnostic methods exist to identify and treat carriers of this bacterium. Serological tests for the diagnosis of infection are based on the detection of antibodies immunoglobulin G against H. pylori, a non-invasive, inexpensive, and easy-to-perform option. Objective: This research aims to ascertain the accuracy of an immunochromatographic serological test to verify the feasibility of using this method in patients who have not undergone previous eradication therapy. Methods: Rapid tests and questionnaires were applied to 53 patients that underwent upper digestive endoscopy with research for H. pylori between the period of September and October 2021. The results were compared with histopathology. Results: In the rapid tests, seven positive and 46 negative results were obtained. When compared with the gold standard, the following values were described: sensitivity 54.5%, specificity 97.6%, positive predictive value 85.7%, and negative predictive value 89.1%. Conclusion: In the present study, the immunochromatographic serological tests had an accuracy close to the values found in other similar studies. Therefore, it may be concluded that the rapid serological test remains a reasonable choice for screening large populations due to its low cost and ease of application, especially in those individuals who have not undergone previous treatment.
RESUMO Contexto: A infecção pelo Helicobacter pylori apresenta-se amplamente difundida globalmente e é comprovadamente causadora de patologias potencialmente graves. Diversos métodos diagnósticos existem com o propósito de identificar e tratar os portadores dessa bactéria. Testes sorológicos para diagnóstico da infecção se baseiam na detecção de anticorpos imunoglobulina G anti-H.pylori, sendo uma opção não-invasiva, barata e de fácil realização. Objetivo: O objetivo dessa pesquisa é determinar a acurácia de um teste sorológico imunocromatográfico para verificar a viabilidade do uso desse método em pacientes que não realizaram terapia de erradicação prévia. Métodos: Foram aplicados testes rápidos e questionários em 53 participantes que realizaram endoscopia digestiva alta com pesquisa de H. pylori entre o período de setembro e outubro de 2021. Os resultados foram comparados com a histopatologia. Resultados: Foram obtidos nos testes rápidos 7 resultados positivos e 46 negativos. Ao comparar com o padrão-ouro, os seguintes valores foram descritos: Sensibilidade 54,5%, especificidade 97,6%, valor preditivo positivo 85,7% e valor preditivo negativo 89,1%. No presente estudo, os testes sorológicos imunocromatográficos tiveram acurácia próxima aos valores encontrados em outros trabalhos semelhantes. Conclusão: Sendo assim, conclui-se que o teste rápido sorológico permanece como escolha razoável para screening de grandes populações devido ao seu baixo custo e facilidade de aplicação, especialmente naqueles indivíduos que não realizaram tratamento prévio.
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The objective of this study was to validate an indirect enzyme-linked immunoassay (iELISA) using the recombinant proteins, malate dehydrogenase (MDH) and superoxide dismutase (SOD) [CuZn], as antigens and to evaluate its ability to discriminate antibodies produced by vaccination from those induced by infection in the diagnosis of bovine brucellosis. Sera from six groups were evaluated: G1 - culture-positive animals (52 serum samples) (naturally infected); G2 - non-vaccinated animals (28 serum samples) positive in RBT (Rose Bengal test) and 2ME (2-mercaptoethanol test) selected from brucellosis-positive herds; G3 - animals from a brucellosis-free area (32 serum samples); G4 - S19 vaccinated heifers (114 serum samples); G5 - RB51 vaccinated heifers (60 serum samples); G6 - animals inoculated with inactivated Yersinia enterocolitica O:9 (42 serum samples). Diagnostic sensitivity (DSe) and diagnostic specificity (DSp) were estimated using the frequentist approach and the confidence interval (CI) (95%) calculated by the Clopper-Pearson (exact) method. The DSe for iELISA_MDH in the G1 group was 71.7% (CI 95%: 57.6-83.2%) and for the G2 100.0% (CI 95%: 87.7-100.0%), whereas the DSp was 84.4% in the G3 (CI 95%: 67.2-94.7%). For the iELISA_SOD the DSe was estimated 67.3% for the G1 (CI 95%: 52.9-79.7%) and 71.4% for G2 (CI 95%: 51.3-86.8%), while the DSp for G3 was 87.5% (CI 95%: 71.0-96.5%). iELISA_MDH and iELISA_SOD showed potential to be used in the diagnosis of infected animals, increasing the range of serological tests available for the diagnosis of bovine brucellosis, with the advantage of being S-LPS-free. However, none of the tests could differentiate between infection and vaccination.
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Brucelose Bovina , Brucelose , Animais , Bovinos , Feminino , Malato Desidrogenase , Ensaio de Imunoadsorção Enzimática/métodos , Brucelose/diagnóstico , Brucelose/veterinária , Testes Sorológicos/métodos , Anticorpos Antibacterianos , Sensibilidade e EspecificidadeRESUMO
INTRODUCTION: Leprosy is a chronic infectious disease caused by two mycobacteria (Mycobacterium leprae and Mycobacterium lepromatosis). The household contacts (HHC) of leprosy index cases are at higher risk of being infected with these mycobacteria. Therefore, serological testing in HHC would be an effective strategy to eliminate leprosy in Colombia. OBJECTIVE: To determine the seroprevalence and factors associated with the infection by M. leprae in HHC. METHODS: An observational study was conducted in 428 HHC located in the Colombian Caribbean, Andean, Pacific, and Amazonian regions. We evaluated the seropositivity and titrations of IgM, IgG, and protein A against NDO-LID. RESULTS: The evaluated HHC showed high seropositivity, precisely 36.9% anti-NDO-LID IgM, 28.3% anti-NDO-LID IgG, and 47.7% protein A. Furthermore, Protein A showed a greater capacity to detect infected individuals than other anti-NDO-LID conjugates (p < 0.0001). This study did not show differences in the seropositivity according to sex or age of the HHC (p > 0.05). Higher seropositivity for IgM was evidenced mainly in HHC located in the Colombian Pacific region (p 0.001). This research did not show differences in the seropositivity for these serological tests between HHC of PB or MB leprosy patients (p > 0.05). CONCLUSION: Leprosy transmission is still active between Colombian HHC. Consequently, controlling leprosy transmission in this population is fundamental to eradicating this disease.
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Antígenos de Bactérias , Hanseníase , Humanos , Colômbia/epidemiologia , Estudos Soroepidemiológicos , Ensaio de Imunoadsorção Enzimática , Anticorpos Antibacterianos , Hanseníase/epidemiologia , Hanseníase/prevenção & controle , Hanseníase/diagnóstico , Mycobacterium leprae , Imunoglobulina G , Imunoglobulina MRESUMO
The seventh human coronavirus was discovered and reported primarily in Wuhan, China. After intense seasons with repercussions in all areas of humanity, the pandemic demonstrates a new perspective. In Brazil, the pandemic concept had impacts in vast areas, including healthcare hospitals. This present study aims to describe and synthesize data from a determined period from the year 2021 that correlate the symptoms of passive and/or active patients for COVID-19 and their respective results of IgG/IgM serological tests in hospitals in the city of Cruzeiro, São Paulo, Brazil. The form had been applied to 333 people and obtained conclusive results and several symptoms were presented; in addition, asymptomatic cases were also analyzed and directed in the genomic study of variants of concern, as well as vaccination data in the study region.
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Objetivo: descrever o perfil epidemiológico e identificar as causas prevalentes de inaptidão clínica e sorológica entre os candidatos à doação nos últimos cinco anos. Método: trata-se de um estudo seccional, exploratório e analítico. Os dados foram obtidos por meio do Sistema Hemote Plus®. Resultados: a maioria dos candidatos eram homens (50,9%), de 20 a 29 anos (34,0%), brancos (66,7%), solteiros (59,9%) com ensino médio completo (33,3%) e motivação espontânea (65,5%). Dentre eles,25,9% foram considerados inaptos. As causas mais prevalentes de inaptidão foram: anemia (27,7%) e infecções sexualmente transmissíveis (12,4%). Tenderam mais à inaptidão as mulheres (57,9%), indivíduos menor nível de escolaridade (53,9%), e com menos de 39 anos (65,5%). Conclusão: evidencia-se a necessidade de práticas educativas e orientação sobre comportamentos de risco na captação de doadores e triagem clínica, ressaltando a importância do profissional de enfermagem neste contexto
Objetivo: to describe the epidemiological profile and identify the prevalent causes of clinical and serological unfitness among donation candidates in the last five years. Methods: this is a cross-sectional, exploratory and analytical study. Data were obtained using the Hemote Plus® System. Results: most candidates were men (50.9%), aged 20 to 29 years (34.0%), white (66.7%), single (59.9%) with high school education (33.3 %) and spontaneous motivation (65.5%). Among them, 25.9% were considered unfit. The most prevalent causes of disability were: anemia (27.7%) and sexually transmitted infections (12.4%). Women (57.9%), individuals with a lower level of education (53.9%), and those with less than 39 years of age (65.5%) tended more toward disability. Conclusion: it is evident the need for educational practices and guidance on risk behaviors in the recruitment of donors and clinical screening, emphasizing the importance of the nursing professional in this context
Objetivos: describir el perfil epidemiológico e identificar las causas prevalentes de ineptitud clínica y serológica entre los candidatos a donación en los últimos cinco años. Metodo: se trata de um estudio transversal, exploratorio y analítico. Los datos se obtuvieron utilizando el sistema Hemote Plus®. Resultados: la mayoría de los candidatos eran hombres (50,9 %), de 20 a 29 años (34,0 %), blancos (66,7 %), solteros (59,9 %), com educación secundaria (33,3 %) y motivación espontánea (65,5 %). Entre ellos, el 25,9% fueron considerados no aptos. Las causas de discapacidad más prevalentes fueron: anemia (27,7%) e infecciones de transmisión sexual (12,4%). Las mujeres (57,9%), los indivíduos con menor nivel educativo (53,9%) y los menores de 39 años (65,5%) tendían más a la discapacidad. Conclusión: se evidencia la necesidad de prácticas educativas y orientaciones sobre comportamientos de riesgo em la captación de donantes y tamizaje clínico, destacando la importância del profesional de enfermeira en este contexto
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Humanos , Masculino , Feminino , Adolescente , Adulto , Adulto Jovem , Doadores de Sangue , Testes Sorológicos , Seleção do Doador , Perfil de Saúde , Fatores de RiscoRESUMO
Commercial inactivated avian influenza H5 vaccine is used as an essential control strategy for avian influenza disease in Egypt. Since the initial outbreaks of highly pathogenic avian influenza H5N8, the virus has diverged with new genotypes and variant viruses continuing to emerge which mainly stand behind vaccination failure. In the present work, four different commercial avian influenza vaccines were inoculated in specific pathogenic free chickens for assessing its efficacy against local highly pathogenic avian influenza H5N8 virus isolated in 2018 and 2020. Two hundred and forty specific pathogenic free chickens were clustered into four groups; each group was inoculated with the corresponding vaccine (60 specific pathogenic free chickens/vaccine). Sixty specific pathogenic free chicks were kept as control unvaccinated group. Sera collected from vaccinated chicken groups at 3rd and 4th week post vaccination were examined for calculating neutralizing antibodies using heterologous highly pathogenic avian influenza H5N8 2018 and 2020. At 4th week post vaccination, vaccinated chickens were challenged; moreover, oropharyngeal swabs were collected from challenged vaccinated chickens to calculate the viral shedding. Our findings revealed the groups vaccinated with vaccine code no 1 and 2 that contains two vaccine strains (H5N1 and H5N8) of local origin exhibited the highest hemagglutination inhibition titer, protection (percent) and reduction in viral shedding titer when examined by highly pathogenic avian influenza H5N8 2018 while, vaccine code no 3 induced lower antibody response, protection (percent) and reduction in viral shedding, but still within satisfactory level when compared to previous groups. When highly pathogenic avian influenza H5N8 2020 was used, it was found the seroconversion rate, protection (percent) and mean titer of reduction of viral shedding decreased in comparison to those recorded for highly pathogenic avian influenza H5N8 2018. Vaccine code no 4 was impotent to either highly pathogenic avian influenza 2018 or 2020. Accordingly, it was recommended to update vaccine strain according to epidemiological condition and used the predominant circulating strain isolate in challenge test(AU)
La vacuna comercial inactivada H5 se utiliza como estrategia esencial de control de la enfermedad de la gripe aviar en Egipto. Desde los brotes iniciales de la gripe aviar altamente patógena H5N8, el virus ha variado al aparecer continuamente nuevos genotipos y variantes virales, que son los principales responsables del fracaso de la vacunación. En el presente trabajo, cuatro vacunas comerciales diferentes contra la gripe aviar se inocularon en pollos libres de patógenos específicos para evaluar su eficacia contra cepas del virus local de la gripe aviar altamente patógeno H5N8 aisladas en 2018 y 2020. Se agruparon 240 pollos pollos libres de patógenos específicos en cuatro grupos, cada uno fue inoculado con la vacuna correspondiente (60 pollos pollos libres de patógenos específicos/vacuna). Sesenta pollos SPF se mantuvieron como grupo control sin vacunar. Los sueros de los pollos vacunados recogidos en la 3ª y 4ª semana después de la vacunación se examinaron para calcular los anticuerpos neutralizantes contra la gripe aviar heteróloga H5N8 2018 y 2020. En la cuarta semana después de la vacunación, los pollos vacunados fueron retados; además, se recogieron hisopados orofaríngeos de los pollos vacunados retados para calcular la diseminación viral. Nuestros resultados revelaron que los grupos vacunados con las vacunas con códigos nº 1 y 2, que contienen dos cepas vacunales (H5N1 y H5N8) de origen local, mostraron el mayor título de inhibición de la hemaglutinación, protección (por ciento) y reducción del título de excreción viral cuando se evaluaron contra la gripe aviar altamente patógena H5N8 2018, mientras que la vacuna con código nº 3 indujo menor respuesta de anticuerpos, protección (por ciento) y reducción de la excreción viral, pero todavía dentro de un nivel satisfactorio en comparación con los grupos anteriores. Al utilizar la vacuna contra la gripe aviar altamente patógena H5N8 2020, se observó que la tasa de seronconversión, la protección (por ciento) y el título medio de reducción de la excreción viral disminuyeron en comparación con los registrados para la gripe aviar altamente patógena H5N8 2018. La vacuna con código nº 4 no fue potente para la gripe aviar altamente patógena de 2018 o de 2020. Por consiguiente, se recomendó actualizar la cepa de la vacuna de acuerdo con las condiciones epidemiológicas y utilizar el aislamiento de la cepa circulante predominante en la prueba de reto(AU)
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Animais , Embrião de Galinha , Testes Sorológicos/métodos , Vacinas contra Influenza/uso terapêutico , Influenza Aviária/prevenção & controleRESUMO
Human parvovirus B19 (B19V) is the aetiological agent of erythema infectiosum. Primary infection during pregnancy can be transmitted to the foetus and cause foetal abnormalities related to depletion of erythrocyte progenitor cells, including congenital anaemia, hydrops, and foetal death. In this paper we report the detection of B19V infection in a pregnant patient, which onset occurred without appreciable signs and symptoms until she developed inappropriate contractions for gestational age and fluid loss. B19V infection resulted in severe hydrops fetalis with a fatal course for the foetus, while persisted in the mother at least 12 months after foetal death. The objective of this report is to highlight the importance of optimizing B19V diagnosis through early suspicion and testing during pregnancy. Knowing the mother's immune status before or at the beginning of gestation can contribute, together with early diagnosis, to improve the management of patients at risk.
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Após a pandemia provocada pelo SARS COV-2 atingir a Europa, o Brasil tornou-se um dos epicentros. Considerando diferenças históricas nos indicadores de saúde entre as regiões Sul e Nordeste do país, regidas pelo mesmo sistema de saúde, este estudo tem como objetivo descrever a evolução inicial da pandemia nestas regiões a partir de informações das plataformas digitais das secretarias estaduais de saúde. Foram analisados número de casos, óbitos e testes realizados, de fevereiro de 2020 a maio de 2021. Os dados foram relacionados com as medidas de enfrentamento à pandemia tomadas pelos estados, coletadas a partir dos decretos de restrições e flexibilizações dos serviços e comércio. No Sul, o estado com mais casos foi Santa Catarina (13350/100.000hab), o Rio Grande do Sul teve maior taxa de mortalidade (246,8/100.000hab) e mais testagens (32378/100.000hab). No Nordeste, Sergipe teve mais casos (10216/100.000hab), Piauí mais testagens (23.917/100.000hab) e Ceará teve maior taxa de mortalidade (222,8/100.000hab). As medidas de enfrentamento ao coronavírus no Brasil não foram uniformes entre os estados, nem a aplicação das testagens, evidenciando a falta de coordenação nacional nas ações. [au]
After the pandemic caused by SARS COV2 reached Europe, Brazil became one of the epicenters. Considering historical differences in health indicators between the South and Northeast regions of the country, coordinated by the same health care system, this study aims to describe the early evolution of the pandemic in these regions based on information collected from state health secretariats online platforms. Data of numbers of cases, deaths and tests carried out, from 2020 to May 2021 were analyzed and related to measures to combat the pandemic by the states, based on decrees. In the South, the state with the most cases was Santa Catarina (13350/100,000 inhab), Rio Grande do Sul had the highest mortality rate (246.8/100,000 inhab) and more testing (32378/100,000 inhab). In the Northeast, Sergipe had more cases (10216/100,000 inhab) and Piau testing (23295/100,000 inhab), Ceará had higher mortality rates (222.8/100,000 inhab). The measures to combat the coronavirus in Brazil were not uniform between the states, nor testing, evidencing the lack of national coordination. [au]
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ABSTRACT Objective: to identify the prevalence and factors associated with late diagnosis of the infection by the Human Immunodeficiency Virus (HIV), in a municipality of São Paulo. Method: an epidemiological, analytical and retrospective study that analyzed the HIV and AIDS cases notified by the health services in the period from 2015 to 2017 using data from the notifications of the Information System for Notifiable Diseases (SINAN Net) corresponding to the users recently diagnosed with HIV/AIDS infection in the municipality of Ribeirão Preto/SP, Brazil. Data collection was in May 2018. The chi-square test was performed, as well as binary logistic regression, where the dependent variable was the AIDS criterion at the moment of notifying infection by HIV. A p-value<0.05 was considered for the association between the variables studied in relation to late diagnosis. Results: of the 829 (100%) new HIV cases, 290 (35.0%) were diagnosed in the condition of AIDS. Most of the population was male and aged between 15 and 34 years old. Oral candidiasis and weight loss greater than 10% were the main symptoms associated with AIDS. It was observed that people with lower schooling levels and older were more prone to late diagnoses. Conclusion: it is necessary to devise strategies that favor timely diagnosis in the municipality under study, particularly among the individuals aged over 45 years old and with lower schooling levels.
RESUMEN Objetivo: identificar la prevalencia y los factores asociados al diagnóstico tardío de la infección ocasionada por el Virus de Inmunodeficiencia Humana (HIV) en un municipio del interior de Brasil. Método: estudio epidemiológico, analítico y retrospectivo que analizó los casos de VIH y SIDA notificados por los servicios de salud entre 2015 y 2017 por medio de los datos de las notificaciones del Sistema de Información de Problemas de Salud pasibles de Notificación (SINAN Net) referentes a los usuarios recién diagnosticados con la infección ocasionada por el VIH/SIDA en el municipio de Ribeirão Preto/SP, Brasil. La recolección de datos fue en mayo de 2018. Se realizaron tanto una prueba de chi-cuadrado como un análisis de regresión logística binaria, en la cual la variable dependiente fue el criterio de SIDA al momento de notificar la infección ocasionada por el HIV. Se consideró un valor de p<0,05 para la asociación entre las variables estudiadas en relación con el diagnóstico tardío. Resultados: entre los 829 (100%) casos nuevos de HIV, 290 (35,0%) fueron diagnosticados en la condición de SIDA. La mayoría de la población era del sexo masculino y pertenecía al grupo etario de 15 a 34 años. Candidiasis oral y pérdida de peso superior al 10% fueron los principales síntomas asociados al SIDA. Se observó que las personas con niveles de educación más bajos y de mayor edad fueron más propensas a ser diagnosticadas tardíamente. Conclusión: es necesario elaborar estrategias que favorezcan el diagnóstico oportuno en el municipio estudiado, particularmente entre las personas de más de 45 años de edad y con niveles de educación más bajos.
RESUMO Objetivo: identificar a prevalência e os fatores associados ao diagnóstico tardio da infecção pelo vírus da imunodeficiência humana (HIV), em um município do interior paulista. Método: estudo epidemiológico, analítico e retrospectivo que analisou os casos de HIV e AIDS notificados pelos serviços de saúde no período de 2015 a 2017 por meio dos dados das notificações do Sistema de Informação de Agravos de Notificação (Sinan Net) dos usuários recém-diagnosticados para a infecção pelo HIV/AIDS no município de Ribeirão Preto/SP, Brasil. A coleta de dados ocorreu em maio de 2018. Foi realizado o teste qui-quadrado e regressão logística binária, no qual a variável dependente foi o critério de AIDS no momento da notificação da infecção pelo HIV. Foi considerado o valor de p<0,05 para a associação entre as variáveis estudadas com relação ao diagnóstico tardio. Resultados: dentre os 829 (100%) casos novos de HIV, 290 (35,0%) foram diagnosticados na condição de AIDS. A maioria da população pertencia ao sexo masculino e na faixa etária dos 15 aos 34 anos. A candidose oral e a perda de peso acima de 10% foram os principais sintomas associados à AIDS. Observou-se que pessoas com menor escolaridade e com o aumento da idade eram mais propensas a serem diagnosticadas tardiamente. Conclusão: estratégias que favoreçam o diagnóstico oportuno no município estudado são necessárias, particularmente entre os indivíduos com idade acima de 45 anos e com menor escolaridade.
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Humanos , Masculino , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Idoso , Adulto Jovem , Infecções por HIV , Estudos Retrospectivos , Notificação , Diagnóstico Tardio , Epidemiologia , Síndrome da Imunodeficiência Adquirida , Infecções Oportunistas Relacionadas com a AIDS , Sistemas de Informação em SaúdeRESUMO
Objetivo: identificar o resultado de teste Ml Flow entre casos de hanseníase recém-diagnosticados e contatos intradomiciliares.Métodos: estudo transversal, descritivo, com abordagem quantitativa realizado no município de Caxias, Maranhão, Brasil, onde recrutou-se casos recém-diagnosticados, virgens de tratamento e contatos intradomiciliares. Resultados: recrutou-se 324 contatos de casos de hanseníase, no período de 2015 a 2018. Nos casos recém-diagnosticados o teste Ml Flow foi negativo em 87,5% (7/8) dos paucibacilares e positivo em 70% (21/30) dos multibacilares, ambos concordantes com a baciloscopia do raspado intradérmico. Identificou-se 30 (9%) contatos intradomiciliares com alto risco de adoecer. Conclusão: o teste Ml Flow constitui-se uma ferramenta útil para correta detecção de contatos com alta chance de adoecer da hanseníase, bem como para classificar corretamente os casos novos
Objective: to identify the Ml Flow test result between newly diagnosed leprosy cases and household contacts. Methods: cross-sectional, descriptive study with a quantitative approach carried out in the city of Caxias, Maranhão, Brazil, where newly diagnosed cases, treatment virgins and intra-household contacts were recruited. Results: 324 contacts of leprosy cases were recruited from 2015 to 2018. In newly diagnosed cases, the Ml Flow test was negative in 87.5% (7/8) of paucibacillary patients and positive in 70% (21/ 30) of the multibacillary, both in agreement with the bacilloscopy of the intradermal smear. Thirty (9%) household contacts with high risk of illness were identified. Conclusion: the Ml Flow test is a useful tool for the correct detection of contacts with a high chance of getting sick from leprosy, as well as for correctly classifying new cases
Objetivo: identificar el resultado de la prueba Ml Flow entre casos de lepra recién diagnosticados y contactos domésticos. Métodos: estudio descriptivo transversal con abordaje cuantitativo realizado en la ciudad de Caxias, Maranhão, Brasil, donde se reclutaron casos recién diagnosticados, vírgenes en tratamiento y contactos intrafamiliares. Resultados: se reclutaron 324 contactos de casos de lepra entre 2015 y 2018. En los casos recién diagnosticados, la prueba Ml Flow fue negativa en el 87,5% (7/8) de los pacientes paucibacilares y positiva en el 70% (21/30) de los multibacilares, ambos de acuerdo con la baciloscopia del frotis intradérmico. Identificamos 30 (9%) contactos dentro del hogar con alto riesgo de enfermarse. Conclusión: la prueba Ml Flow es una herramienta útil para la correcta detección de contactos con alta probabilidad de enfermarse de lepra, así como para clasificar correctamente nuevos casos
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Humanos , Masculino , Feminino , Testes Sorológicos , Diagnóstico Precoce , Hanseníase , Doenças Transmissíveis , Doenças NegligenciadasRESUMO
Há barreiras de acesso enfrentadas por homens gays e homens que fazem sexo com outros homens (HSH) à testagem e ao tratamento de HIV/aids devido a fatores estruturais e simbólicos. Daí, o objetivo do estudo que fundamenta este artigo é analisar a implementação das estratégias de comunicação para ampliar a testagem e vincular seu resultado ao tratamento de HIV/aids, em Curitiba (PR), pelo projeto A Hora é Agora (AHA), realizado de dezembro de 2014 a setembro de 2017, visando à maior aproximação dos que o executam com homens gays e HSH e ao desenvolvimento de meios mais efetivos de comunicação, identificando facilidades e dificuldades. Utilizou-se abordagem qualitativa por meio da análise documental do plano de comunicação e dos relatórios de atividades. As lições aprendidas foram a boa aceitação das campanhas 'corpo a corpo' feitas por educadores de pares nos espaços públicos, sobretudo em festas gays, e a necessidade de desenvolver estratégias específicas para HSH que não se identificam como gay.
There are access barriers faced by gay men and men who have sex with men (MSM) to be tested for HIV/ Aids and their treatment due to structural and symbolic factors. Hence, the objective of the study that underlies this article is to analyze the implementation of the communication strategies for expanding the testing and to link its result to treatment for HIV/Aids in Curitiba, Paraná, Brazil, by the project A Hora é Agora (AHA), implemented from December 2014 to September 2017, with the aim of coming closer to gay men and MSM and developing more effective means of communication, identifying facilities and difficulties. A qualitative approach by means of the documental analysis of the communication plan and activity reports was developed. The lessons learned were the good acceptance of the 'face to face' campaigns made by peer educators in public spaces, especially at gay parties, and the need to develop specific strategies for MSM who do not identify themselves as being gay.
Los hombres homosexuales y los hombres que tienen sexo con hombres (HSH) enfrentan barreras de acceso a las pruebas y al tratamiento del VIH/Sida provocadas por factores estructurales y simbólicos. De ahí que el objetivo del estudio presentado en este artículo sea analizar la implementación de estrategias de comunicación para ampliar las pruebas y las vincular al tratamiento del VIH/Sida en Curitiba, Paraná, Brasil, practicada por el proyecto A Hora é Agora (AHA), realizado desde diciembre de 2014 hasta septiembre de 2017, con el objetivo de acercarse más a los hombres homosexuales y HSH y desarrollar medios de comunicación más efectivos, identificando facilidades y dificultades. Se utilizó un enfoque cualitativo por medio del análisis documental del plan de comunicación e informes de actividad. Las lecciones aprendidas fueron la buena aceptación de las campañas "mano a mano" realizadas por los educadores de pares en los espacios públicos, especialmente en las fiestas gay, y la necesidad de desarrollar estrategias específicas para los HSH que no se identifican como gay.
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Humanos , Testes Sorológicos , HIV , Homossexualidade Masculina , Comunicação em Saúde , Mídias Sociais , Avaliação de Programas e Projetos de Saúde , Epidemiologia Descritiva , Promoção da SaúdeRESUMO
Serological assays emerged as complementary tools to RT-PCR in the diagnosis of SARS-CoV-2 as well as being needed for epidemiological studies. This study aimed to assess the performance of a rapid test (RT) compared to that of serological tests using finger prick blood samples. A total of 183 samples were evaluated, 88 of which were collected from individuals with negative RT-PCR and 95 from positive RT-PCR individuals. The diagnostic performance of RT (WONDFO®) and LUMIT (PROMEGA®) were compared to that of ELISA (EUROIMMUN®) for detecting antibodies against SARS-CoV-2 according to time from symptoms onset. The IgG antibody tests were detected in 77.4% (LUMIT), 77.9% (RT), and 80.0% (ELISA) of individuals. The detection of antibodies against SARS-CoV-2 increases in accordance with increasing time from symptoms onset. Considering only time from symptoms onset >21 days, the positivity rate ranged from 81.8 to 97.0% between the three tests. The RT and LUMIT showed high agreement with ELISA (agreement = 91.5%, k = 0.83, and agreement = 96.3%, k = 0.9, respectively) in individuals who had symptoms 15 to 21 days before sample collection. Compared to that of the ELISA assay, our results show sensitivity ranged from 95% to 100% for IgG antibody detection in individuals with symptoms onset between 15 and 21 days before sample collection. The specificity was 100% in individuals with symptoms onset >15 days before serological tests. This study shows good performance and high level of agreement of three immunoassays for the detection of SARS-CoV-2 antibodies.
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The present study aimed to compare different indirect and direct diagnostic techniques to diagnose Toxoplasma gondii in free-range chickens. Samples of 386 chickens obtained from 24 Paraná properties were used for serological analysis by indirect fluorescent antibody test (IFAT), modified agglutination test (MAT), and enzyme-linked immunosorbent assay (ELISA). Animals positive by IFAT and/or MAT had their tissues submitted to the mouse bioassay, and those who were positive in this technique had their blood, tissues, and acidic pepsin tissue digestion submitted to PCR (conventional, nested, and quantitative-PCR (qPCR)). One hundred and nineteen chickens (30.8 %) were positive in at least one of the serological tests, being 102 (26.4 %) in the IFAT, 64 (16.6 %) in the MAT, and 62 (16.0 %) in the ELISA. The IFAT was used as a gold standard, and the MAT showed higher sensitivity (46.0 %) and specificity (94.0) compared to ELISA (43.5 % and 93.6 %, respectively). Ninety samples of eighteen chickens positive in the mouse bioassay were subjected to PCR, and according to molecular tests, the conventional PCR detected the T. gondii DNA in 30 % (27/90) of the samples, in 38.8 % (35/90) with nested-PCR and 40.0 % (36/90) with real-time. According to molecular analyzes, the sensitivity was higher in ITS1 nested-PCR (69.4 %) and specificity in conventional PCR-529bp (90.7 %), using the qPCR as the gold standard. MAT and ELISA had similarities in concordance analyzes. The IFAT was the serological technique with the highest agreement with the mouse bioassay, and serological tests in parallel showed to be a good screening option for the isolation of T. gondii in chick tissues. The PCR markers effectively detected the parasite DNA, and the heart was the tissue with the highest number of positives samples. The conventional PCR had sensitivity similar to nested-PCR and qPCR and could be a cheaper alternative to diagnose T. gondii infection in chicken tissues.
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Anticorpos Antiprotozoários , Galinhas , Doenças das Aves Domésticas , Toxoplasma , Toxoplasmose Animal , Testes de Aglutinação/veterinária , Animais , Anticorpos Antiprotozoários/sangue , Bioensaio/veterinária , Galinhas/parasitologia , Marcadores Genéticos/genética , Camundongos , Doenças das Aves Domésticas/diagnóstico , Testes Sorológicos/veterinária , Toxoplasma/genética , Toxoplasma/imunologia , Toxoplasmose Animal/diagnósticoRESUMO
Blue eye disease (BED) of pigs was identified in the early 1980s in La Piedad, Michoacan, Mexico. The causal agent is Porcine orthorubulavirus (PRV), which affects pigs of all ages, producing nervous, respiratory, and reproductive disorders. BED is geographically endemic to the center of Mexico, where 75% of the country's swine industry is concentrated. Due to its adverse effects on the swine industry and the risk of dissemination to other countries, it is essential to have reliable diagnostic methods for BED. The objective of this study was to establish the optimal conditions for three serological tests, hemagglutination inhibition (HI), immunoperoxidase monolayer assay (IPMA), and serum neutralization (SN), and to compare their sensitivity, specificity, kappa coefficient, and predictive values. Twelve different HI protocols (9408 tests), one SN protocol and one IPMA protocol (784 tests, each) were evaluated. Forty-nine sera were analyzed, and thirty-seven sera showed true positive results, while twelve showed true negative results. The kappa coefficient was used to assess the variation in each test. The best HI protocol registered a sensitivity and specificity of 89 and 100%, respectively, the IPMA test showed values of 85 and 100%, and the SN test registered a sensitivity of 91% and a specificity of 96%. One of the disadvantages of the HI test is that when chicken red blood cells (RBCs) are used, elution occurs in a short incubation time, which would decrease the specificity. The use of bovine RBCs increases the specificity of the testy and makes it more stable, but it decreases the sensitivity. The results of HI and SN revealed the importance of eliminating the complement system of the serum and removing other inhibitors to avoid test nonspecificity. The IPMA test does not use an active virus; hence, it is considered safe and does not present any risk of disseminating PRV.
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Anticorpos Neutralizantes/sangue , Anticorpos Antivirais/sangue , Infecções Oculares Virais/diagnóstico , Testes de Inibição da Hemaglutinação/veterinária , Técnicas Imunoenzimáticas/veterinária , Infecções por Rubulavirus/diagnóstico , Rubulavirus/imunologia , Testes Sorológicos/veterinária , Doenças dos Suínos/diagnóstico , Animais , Biomarcadores/sangue , Infecções Oculares Virais/sangue , Infecções Oculares Virais/imunologia , Infecções Oculares Virais/virologia , Testes de Inibição da Hemaglutinação/normas , Técnicas Imunoenzimáticas/normas , México , Valor Preditivo dos Testes , Reprodutibilidade dos Testes , Infecções por Rubulavirus/sangue , Infecções por Rubulavirus/imunologia , Infecções por Rubulavirus/virologia , Testes Sorológicos/normas , Suínos , Doenças dos Suínos/sangue , Doenças dos Suínos/imunologia , Doenças dos Suínos/virologiaRESUMO
Resumen En este trabajo reportamos un caso de brucelosis humana ocasionada por Brucella suis en una persona que trabajaba en un establecimiento de producción porcina en pequeña escala. La granja no tenía antecedentes de la enfermedad y los animales no registraban signos clínicos al ser examinados. Se obtuvieron muestras de suero de todos los padrillos (n=3), de 16/22 chanchas y 9/25 cachorras y se analizaron mediante las técnicas de aglutinación rápida en placa con antígeno tamponado (BPA) y Rosa de Bengala (RB) y Polarización de la Fluorescencia (FPA). Muestras de tejido de un padrillo y de una hembra serológicamente positivos fueron analizadas por cultivo bacteriológico y por la técnica de Inmunofluorescencia Directa (IFD). Se detectaron anticuerpos específicos en el 53% de los cerdos adultos (10/19), mientras que todas las cachorras fueron seronegativas. Se aisló B. suis biovar 1 de un padrillo. En contraste, la bacteria no fue aislada en ninguno de los tejidos de la cerda seropositiva aunque sí se detectó la bacteria mediante IFD. A partir de los datos bacteriológicos y serológicos se evidencia la presencia de una infección endémica por B. suis. Asimismo, teniendo en cuenta la falta de medidas de prevención y de bioseguridad se concluye que la persona probablemente adquirió la enfermedad por contacto directo con los animales infectados o con el ambiente contaminado con la bacteria.
Abstract Here we report a case of human brucellosis due to Brucella suis in a person who worked in a small-scale pig farm. The farm had no history of clinical brucellosis, and signs of the disease were not observed upon clinical examination of the animals. Serum from all the 3 boars, 16/22 sows and 9/25 gilts was obtained for serological examination by Buffered Plate Agglutination Test (BPAT), Rose Bengal Test (RBT) and Fluorescent Polarization Assay (FPA). Bacteriological culture and Direct Fluorescence Antibody Test (DFAT) were performed in tissue samples from a seropositive boar and a sow. Specific antibodies were detected in 53 % (10/19) adult pigs, while all sampled gilts were seronegative. B. suis biovar 1 was isolated from one boar. In contrast, while the bacterium was not isolated from any tissue from a seropositive sow, it was detected by DFAT. From the bacteriological and serological evidence of B. suis endemic infection in the pig farm and the lack of preventive measures and biosecurity practices, it is concluded that the person most likely acquired the disease from the infected animals or by contact with contaminated environment in the farm.
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RESUMO Objetivo: descrever a situação clínica e epidemiológica da sífilis gestacional em Anápolis, Goiás, Brasil, entre os anos de 2012 e 2018. Método: estudo epidemiológico, descritivo e transversal de natureza quantitativa. Como instrumento de coleta, foram utilizados dados da ficha de notificação da sífilis gestacional cadastradas no Departamento de Vigilância Epidemiológica. Para análise estatística, foi utilizado o teste qui-quadrado com nível de significância 5% (p<0,05). Resultados: evidenciou-se aumento dos casos de sífilis gestacional. A assistência foi oferecida a 522 pacientes, entre 19 e 29 anos (58,1%), com etnia parda (69,1%) e com ensino médio incompleto (24,5%); predominou a sífilis primária (30,8%) e alto índice de não tratamento do parceiro (57,1%). Conclusão: dentro do período estudado, houve aumento dos casos de sífilis gestacional e não tratamento do parceiro. Este estudo poderá contribuir para o planejamento de ações de prevenção primária e secundária, visando diminuir a incidência da doença e suas consequências.
RESUMEN Objetivo: describir la situación clínica y epidemiológica de la sífilis gestacional en Anápolis, Goiás, Brasil, entre los años 2012 y 2018. Método: estudio descriptivo y transversal de carácter cuantitativo. Se utilizaron como instrumento de recogida los datos de la ficha de notificación de sífilis gestacional registrada en el Departamento de Vigilancia Epidemiológica. Para el análisis estadístico se utilizó la prueba de chi-cuadrado con un nivel de significación del 5% (p<0,05). Resultados: se evidenció un aumento de los casos de sífilis gestacional. La asistencia se ofreció a 522 mujeres, con edades comprendidas entre los 19 y los 29 años (58,1%), de etnia parda (69,1%) y con estudios secundarios incompletos (24,5%); predominó la sífilis latente (58,1%), seguida de la sífilis primaria (30,8%) y un alto índice de no tratamiento de la pareja (57,1%). Conclusión: dentro del período estudiado, hubo un aumento de los casos de sífilis gestacional y no tratamiento de la pareja. Este estudio puede contribuir a la planificación de acciones de prevención primaria y secundaria, con el objetivo de disminuir la incidencia de la enfermedad y sus consecuencias.
ABSTRACT Objective: to describe the clinical and epidemiological situation of gestational syphilis in Anápolis, Goiás, Brazil, between the years 2012 to 2018. Method: descriptive, cross-sectional study of a quantitative nature. As a collection instrument, data from the gestational syphilis notification form registered in the Epidemiological Surveillance Department were used. For statistical analysis, the chi-square test was used, with a 5% significance level (p<0.05). Results: an increase in gestational syphilis cases was evidenced. Care was offered to 522 women, aged between 19 and 29 years (58.1%), with brown ethnicity (69.1%) and incomplete high school education (24.5%); latent syphilis predominated (58.1%), followed by primary syphilis (30.8%) and a high rate of non-treatment of the partner (57.1%). Conclusion: within the period studied, there was an increase in cases of gestational syphilis and non-treatment of the partner. This study may contribute to the planning of primary and secondary prevention actions, aiming to decrease the incidence of the disease and its consequences.
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RESUMO Objetivo: Analisar os fatores sociodemográficos e comportamentais associados à positividade ao Vírus da Imunodeficiência Humana (HIV) em usuários de um Centro de Testagem e Aconselhamento (CTA). Método: Estudo transversal com 5.229 usuários que realizaram o teste rápido para HIV, registrados no Sistema de Informação do CTA. As análises bivariadas e multivariadas foram realizadas utilizando-se a regressão logística binária, com apresentação do OddsRatio, intervalo de confiança de 95% e p-valor <0,05. Resultados: A prevalência de infecção pelo HIV foi de 5,0% (259), com maior acometimento da população mais jovem (p=0,010). Observou-se maior positividade entre as pessoas vivendo com HIV/Aids (91,3%; p<0,001) e homens que fazem sexo com homens (HSH) (20%; p<0,001). Nas análises multivariadas verificou-se maior associação à infecção pelo HIV no modelo 2 que inclui, as variáveis sociodemográficas e comportamentais, como: o recorte populacional de HSH, o compartilhamento de seringas, a orientação sexual HSH, ter infecções sexualmente transmissíveis (IST) nos últimos 12 meses, parceiro soropositivo para HIV e uso irregular ou não uso do preservativo nos últimos 12 meses com parceiro fixo. Conclusão: A vulnerabilidade ao HIV foi mais associada aos fatores relacionados ao compartilhamento de seringas e ao comportamento sexual, especialmente os HSH e as parcerias fixas.
resumen Objetivo: analizar los factores sociodemográficos y comportamentales asociados a la positividad al Virus de la Inmunodeficiencia Humana (VIH) en usuarios de un Centro de Consejería y Pruebas. Método: estudio transversal con 5.229 usuarios que realizaron la prueba rápida para VIH, registrados en el Sistema de Información del Centro. Los análisis bivariados y multivariados fueron realizados utilizando la regresión logística binaria, con presentación del OddsRatio, intervalo de confianza de 95% y p-valor <0,05. Resultados: la prevalencia de infección por el VIH fue de 5,0% (259), con mayor acometimiento de la población más joven (p=0,010). Se observó mayor positividad entre las personas viviendo con VIH/sida (91,3%; p<0,001) y hombres que hacen sexo con hombres (HSH) (20%; p<0,001). En los análisis multivariados se verificó mayor asociacióna la infección por el VIH en el modelo 2 que incluye las variables sociodemográficas y comportamentales como: el recorte poblacional de HSH, el compartir jeringas, la orientación sexual HSH, tener enfermedades de transmisión sexual (ETS) en los últimos 12 meses, compañero seropositivo para VIHy uso irregular o la falta del uso de preservativo en los últimos 12 meses con compañero fijo. Conclusión: la vulnerabilidad al VIH fue más asociada a los factores relacionados al compartir jeringas y al comportamiento sexual, especialmente los HSH y los compañeros fijos.
ABSTRACT Objective: To analyze the sociodemographic and behavioral factors associated with Human Immunodeficiency Virus (HIV) positivity in users of a Counseling and Testing Center (CTC). Method: Across-sectional study with 5,229 users who performed the rapid HIV test, registered in the CTC's Information System. Bivariate and multivariate analyzes were performed using binary logistic regression, presenting OddsRatio, 95% confidence interval and p-value <0.05. Results: The prevalence of HIV infection was 5.0% (259), with greater involvement of the younger population (p=0.010). Greater positivity was observed among people living with HIV/AIDS(91.3%; p <0.001) and men who have sex with men (MSM) (20%; p<0.001). In multivariate analyzes, there was a greater association with HIV infection in model 2, which includes sociodemographic and behavioral variables, such as: the populational cut of MSM, needle sharing, MSM sexual orientation, having sexually transmitted infections (STIs) in the last 12 months, HIV-positive partner and irregular or no condom use in the last 12 months with a steady partner. Results: Conclusion: Vulnerability to HIV was more associated with factors related to needle sharing and sexual behavior, especially MSM and steady partnerships.
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Humanos , Masculino , Feminino , Infecções por HIV , HIV , Aconselhamento , Comportamento Sexual , Seringas , Comportamento , Testes Sorológicos , Infecções Sexualmente Transmissíveis , Soroprevalência de HIV , Prevalência , Síndrome da Imunodeficiência Adquirida , Uso Comum de Agulhas e Seringas , Preservativos , Minorias Sexuais e de GêneroRESUMO
Abstract Objectives: To analyze the factors associated with leprosy in children who were intradomiciliary contacts of notified adults with the disease in an endemic municipality in Mato Grosso, Brazil. Method: Case-control study with 204 children under 15 years of age, living in an endemic municipality. Cases (n = 40) were considered as the children with leprosy registered at the National Information System of Notifiable Diseases in 2014 and 2015, who were intradomiciliary contacts of at least one adult diagnosed with the disease in the family, and as a control group (n = 164) of children living within a radius of up to 100 m of the notified cases. Data were obtained through medical file analysis, interviews, and blood samples for anti-PGL-I serological test by the ELISA method. The binary logistic regression technique was used, with p ≤ 0.05. Results: After adjustments, the following were associated with leprosy: age (95% CI: 1.24-9.39, p = 0.018), area of residence (95% CI: 1.11-6.09, p = 0.027), waste disposal (95% CI: 1.91-27.98, p = 0.004), family history of the disease (95% CI: 3.41-22.50, p = 0.000), and time of residence (95% CI: 1.45-7.78, p = 0.005). Conclusion: Factors associated with the disease indicate greater vulnerability of children aged 8-14 years, associated with living conditions and time of residence, as well as the family history of the disease.
Resumo Objetivos: Analisar os fatores associados à hanseníase em crianças contatos intradomiciliares de adultos notificados com a doença em município endêmico, Mato Grosso, Brasil. Método: Estudo caso-controle com 204 menores de 15 anos residentes em um município endêmico. Consideraram-se casos (n = 40) crianças registradas com hanseníase no Sistema Nacional de Agravos de Notificação em 2014 e 2015 e que eram contatos intradomiciliares de pelo menos um adulto diagnosticado com a doença na família e como grupo controle (n = 164) crianças residentes a um raio de 100 metros dos casos notificados. Os dados foram obtidos por meio de análise de prontuários, entrevistas e coleta de amostras de sangue para investigação sorológica do anti-PGL-I pelo método Elisa. Usou-se a técnica de regressão logística binária e p ≤ 0,05. Resultados: Mostraram-se associados à hanseníase após ajustes: idade (IC 95%: 1,24-9,39; p = 0,018), zona de residência (IC 95%: 1,11-6,09; p = 0,027), destino de lixo (IC 95%: 1,91-27,98; p = 0,004), história da doença na família (IC 95%: 3,41-22,50; p = 0,000) e tempo de moradia (IC 95%: 1,45-7,78; p = 0,005). Conclusão: Os fatores associados à doença indicam maior vulnerabilidade em menores de 8 a 14 anos, ligadas as condições e ao tempo de moradia, bem como a história da doença na família.
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Humanos , Criança , Adolescente , Adulto , Hanseníase/epidemiologia , Brasil/epidemiologia , Ensaio de Imunoadsorção Enzimática , Estudos de Casos e Controles , HabitaçãoRESUMO
The objective of this study was to investigate the effects of Spirulina platensis (SP) powder supplementation on immune response in SPF chickens. For this purpose, 120 SPF chicks were randomly clustered into six groups consisting of 20 birds each which assigned to five groups vaccinated by commercial inactivated Newcastle disease (ND) vaccine at 21 days of age. The four groups were supplemented with 0.5, 1, 1.5 and 2 g of SP per kg of ration at 7 day of age and other group as control treatment group. Control unvaccinated group still without any treatment. Individual blood samples were collected weekly from all groups, and NDV-HI antibodies were measured using Hemagglutination inhibition (HI) test. After 28 days post-vaccination, ten birds from all groups were challenged intramuscularly at a dose 0.5 mL/bird containing 106 EID50 of local NDV genotype VII. Challenge virus shedding was detected using real time qrt-PCR of oropharyngeal swabs that were collected from all challenged chicken groups of at 3, 5, 7 and 10 days post challenge. Obtained results showed that vaccinated groups of SPF-chickens either supplied with Spirulina or control treatment group induced positive serological response as NDV-HI antibody were measured in sera of immunized chicks (7.6, 8, 8.3, 8.9 and 7.4 log2, respectively) at 4 weeks post vaccination (WPV). Significant differences were observed at 2 WPV in the vaccinated SPF chickens consumed 1, 1.5 and 2 g of SP/kg of ration, compared to untreated vaccinated group (p<0.05). Immunized SPF chickens supplied with different SP concentration confer satisfactory protection against heterologous challenge virus (90 percent, 100 percent, 100 percent and 100 percent respectively), in contrast to untreated vaccinated chickens. Different percentages of reduction of viral shedding (55 percent, 65 percent, 76 percent and 87 percent) of treated vaccinated chickens with different concentration of SP were detected, despite untreated group were reduced 46 percent from total viral shedding. These findings suggest that dietary Spirulina has immune-stimulatory effects on the immune system of SPF chickens. One gram from SP per kg of ration was minimum recommended concentration that able to exhibit optimum immune response, increase protection against heterologous strains and able to reduce viral shedding(AU)
El objetivo de este estudio fue investigar los efectos de la suplementación con polvo de Spirulina platensis (SP) sobre la respuesta inmune en pollos SPF. Para este propósito se agruparon al azar 120 polluelos SPF en seis grupos de 20 aves cada uno, que se asignaron a cinco grupos vacunados con la vacuna comercial inactivada contra la enfermedad de Newcastle (ND) a los 21 días de edad. Cuatro grupos se suplementaron con 0,5; 1; 1,5 y 2 g de SP por kg de ración a los 7 días de edad, un grupo vacunado sin suplemento y un grupo sin ningún tratamiento. Semanalmente, se recogieron muestras de sangre individuales de todos los grupos y se midieron los anticuerpos hemaglutinantes contra el virus Newcastle (NDV-HI) mediante la prueba de inhibición de la hemaglutinación (HI). 28 días después de la vacunación, fueron retadas diez aves de cada grupo por vía intramuscular a una dosis 106 EID50 del genotipo VII del NDV local en un volumen de 0,5 mL/ave. Se detectó la eliminación del virus mediante qrt-PCR en hisopos orofaríngeos que se recolectaron en todos los grupos a los 3, 5, 7 y 10 días después del reto. Los resultados obtenidos mostraron que los grupos vacunados de pollos y suplementados con Espirulina y el grupo de control vacunado, indujeron una respuesta serológica positiva cuando se determinaron los anticuerpos NDV-HI en los pollitos inmunizados (7,6; 8; 8,3; 8,9 y 7,4 log2 respectivamente) a las 4 semanas después de la vacunación (SPV). Se observaron diferencias significativas a las 2 SPV en los pollos vacunados que consumieron 1, 1,5 y 2 g de SP/kg de ración, en comparación con el grupo vacunado no tratado (p<0,05). Los pollos inmunizados que recibieron diferentes concentraciones de SP mostraron una protección satisfactoria contra el desafío heterólogo viral (90 por ciento, 100 por ciento y 100 por ciento respectivamente), en contraste con los pollos vacunados no tratados. Se observaron diferentes porcentajes de reducción de la diseminación viral (55 por ciento, 76 por ciento y 87 por ciento) entre los pollos vacunados tratados con diferente concentración de SP. En el grupo no tratado se redujo al 46 por ciento. Estos hallazgos sugieren que la Espirulina en la dieta tiene efectos inmunoestimuladores sobre el sistema inmunitario de los pollos. Un gramo de SP por kg de ración fue la concentración mínima recomendada para una respuesta inmune óptima, y de esta forma aumentar la protección contra las cepas heterólogas y disminuir la diseminación viral(AU)