RESUMEN
Although it had been reported that Israeli acute paralysis virus (IAPV) can cause systemic infection in honey bees, little is known about how it establishes this infection and results in the typical symptoms, paralysis and trembling. Here, we used our previously constructed IAPV infectious clone to investigate viral loads in different tissues of honey bees and further identify the relation between tissue tropism and paralytic symptoms. Our results showed that tracheae showed a greater concentration of viral abundance than other tissues. The abundance of viral protein in the tracheae was positively associated with viral titers, and was further confirmed by immunological and ultrastructural evidence. Furthermore, higher viral loads in tracheae induced remarkable down-regulation of succinate dehydrogenase and cytochrome c oxidase genes, and progressed to causing respiratory failure of honey bees, resulting in the appearance of typical symptoms, paralysis and body trembling. Our results showed that paralysis symptoms or trembling was actually to mitigate tachypnea induced by IAPV infection due to the impairment of honey bee tracheae, and revealed a direct causal link between paralysis symptoms and tissue tropism. These findings provide new insights into the understanding of the underlying mechanism of paralysis symptoms of honey bees after viral infection and have implications for viral disease prevention and specific therapeutics in practice.
Asunto(s)
Dicistroviridae , Parálisis/fisiopatología , Taquipnea/fisiopatología , Virosis/fisiopatología , Animales , Abejas/virología , Complejo IV de Transporte de Electrones/metabolismo , Parálisis/virología , Succinato Deshidrogenasa/metabolismo , Taquipnea/virología , Tráquea/virología , Carga Viral , Proteínas Virales , Virosis/virologíaRESUMEN
Although severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA is generally detected in nasopharyngeal swabs, viral RNA can be found in other samples including blood. Recently, associations between SARS-CoV-2 RNAaemia and disease severity and mortality have been reported in adults, while no reports are available in pediatric patients with coronavirus disease 2019 (COVID-19). The aim of this study was to evaluate the mortality, severity, clinical, and laboratory findings of SARS-CoV-2 RNA detection in blood in 96 pediatric patients with confirmed COVID-19. Among all patients, 6 (6%) had SARS-CoV-2 RNAaemia. Out of the six patients with SARS-CoV-2 RNAaemia, four (67%) had a severe form of the disease, and two out of the 6 patients with SARS-CoV-2 RNAaemia passed away (33%). Our results show that the symptoms more commonly found in the cases of COVID-19 in the study (fever, cough, tachypnea, and vomiting), were found at a higher percentage in the patients with SARS-CoV-2 RNAaemia. Creatine phosphokinase and magnesium tests showed significant differences between the positive and negative SARS-CoV-2 RNAaemia groups. Among all laboratory tests, magnesium and creatine phosphokinase could better predict SARS-CoV-2 RNAemia with area under the curve levels of 0.808 and 0.748, respectively. In conclusion, 67% of individuals with SARS-CoV-2 RNAaemia showed a severe COVID-19 and one-third of the patients with SARS-CoV-2 RNAaemia passed away. Our findings suggest that magnesium and creatine phosphokinase might be considered as markers to estimate the SARS-CoV-2 RNAaemia.
Asunto(s)
COVID-19/patología , Creatina Quinasa/sangre , Magnesio/sangre , ARN Viral/sangre , SARS-CoV-2/patogenicidad , Viremia/patología , Adolescente , Biomarcadores/sangre , COVID-19/diagnóstico , COVID-19/mortalidad , COVID-19/virología , Prueba de Ácido Nucleico para COVID-19 , Niño , Preescolar , Tos/diagnóstico , Tos/mortalidad , Tos/patología , Tos/virología , Femenino , Fiebre/diagnóstico , Fiebre/mortalidad , Fiebre/patología , Fiebre/virología , Hospitales , Humanos , Lactante , Recién Nacido , Irán , Masculino , ARN Viral/genética , SARS-CoV-2/genética , Índice de Severidad de la Enfermedad , Análisis de Supervivencia , Taquipnea/diagnóstico , Taquipnea/mortalidad , Taquipnea/patología , Taquipnea/virología , Viremia/diagnóstico , Viremia/mortalidad , Viremia/virologíaRESUMEN
In this study, we investigated the epidemiology and molecular characteristics of enteroviruses associated with severe hand, foot and mouth disease (HFMD) in Shenzhen, China, during 2014-2018. A total of 137 fecal specimens from patients with severe HFMD were collected. Enterovirus (EV) types were determined using real-time reverse transcription polymerase chain reaction (RT-PCR), RT nested PCR, and sequencing. Sequences were analyzed using bioinformatics programs. Of 137 specimens tested, 97 (70.8%), 12 (8.8%), and 10 (7.3%) were positive for EV-A71, coxsackievirus A6 (CVA6), and CVA16, respectively. Other pathogens detected included CVA2 (2.9%, 4/137), CVA10 (2.9%, 4/137), CVA5 (0.7%, 1/137), echovirus 6 (E6) (0.7%, 1/137) and E18 (0.7%, 1/137). The most frequent complication in patients with proven EV infections was myoclonic jerk, followed by aseptic encephalitis, tachypnea, and vomiting. The frequencies of vomiting and abnormal eye movements were higher in EV-A71-infected patients than that in CVA6-infected or CVA16-infected patients. Molecular phylogeny based on the complete VP1 gene revealed no association between the subgenotype of the virus and disease severity. Nevertheless, 12 significant mutations that were likely to be associated with virulence or the clinical phenotype were observed in the 5'UTR, 2Apro, 2C, 3A, 3Dpol and 3'UTR of CVA6. Eight significant mutations were observed in the 5'UTR, 2B, 3A, 3Dpol and 3'UTR of CVA16, and 10 significant mutations were observed in the 5'UTR, VP1, 3A and 3Cpro of CVA10. In conclusion, EV-A71 is still the main pathogen causing severe HFMD, although other EV types can also cause severe complications. Potential virulence or phenotype-associated sites were identified in the genomes of CVA6, CVA16, and CVA10.
Asunto(s)
Proteínas de la Cápside/genética , Encefalitis/epidemiología , Enterovirus Humano C/genética , Enfermedad de Boca, Mano y Pie/epidemiología , Mioclonía/epidemiología , Taquipnea/epidemiología , Vómitos/epidemiología , Niño , Preescolar , China/epidemiología , Encefalitis/diagnóstico , Encefalitis/fisiopatología , Encefalitis/virología , Enterovirus Humano C/clasificación , Enterovirus Humano C/aislamiento & purificación , Heces/virología , Femenino , Expresión Génica , Genotipo , Enfermedad de Boca, Mano y Pie/diagnóstico , Enfermedad de Boca, Mano y Pie/fisiopatología , Enfermedad de Boca, Mano y Pie/virología , Humanos , Lactante , Recién Nacido , Masculino , Epidemiología Molecular , Mutación , Mioclonía/diagnóstico , Mioclonía/fisiopatología , Mioclonía/virología , Fenotipo , Filogenia , Índice de Severidad de la Enfermedad , Taquipnea/diagnóstico , Taquipnea/fisiopatología , Taquipnea/virología , Virulencia , Vómitos/diagnóstico , Vómitos/fisiopatología , Vómitos/virologíaRESUMEN
PURPOSE: To report the spectrum of chest computed tomographic (CT) imaging findings in coronavirus disease-19 (COVID-19) infected Indian patients. METHODS: This was a prospective descriptive study comprising 147 consecutive reverse transcriptase polymerase chain reaction (RT-PCR) positive patients who underwent CT chest. Prevalence, distribution, extent and type of abnormal lung findings were recorded. RESULTS: Among the total study cohort of 147 patients, 104 (70.7 %) were males and 43 (29.3 %) were females with mean age of 40.9⯱â¯17.2 years (range 24-71 years). We observed lung parenchymal abnormalities in 51 (34.7 %) cases whereas 96 (65.3 %) RT-PCR positive cases had a normal chest CT. Only 12.2 % of the patients were dyspneic, 6.1 % had desaturation, 7.4 % had increased respiratory rate and 10.9 % had comorbidities. Among the patients with abnormal CT findings bilateral 39/51 (76.5 %), multilobar (88.2 %) lung involvement with a predominant peripheral and posterior distribution was commonly observed. With regards to the type of opacity, ground glass opacity (GGO) was the dominant abnormality found in all 51 (100 %) cases. Pure GGO was observed in 15 (29.4 %), GGO with crazy paving pattern was seen in 15 (29.4 %) and GGO mixed with consolidation was noted in 21(41.2 %). Peri-lesional or intralesional segmental or subsegmental pulmonary vessel enlargement was observed in 36 (70.6 %) cases. CONCLUSION: In this study population predominantly with mild symptoms and few comorbidities, two-thirds of RT-PCR positive patients had a normal chest CT; whereas the remaining patients showed typical findings of predominant GGOs with a bilateral distribution and peripheral predominance.
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Betacoronavirus , Técnicas de Laboratorio Clínico/métodos , Infecciones por Coronavirus/diagnóstico por imagen , Neumonía Viral/diagnóstico por imagen , Adulto , Anciano , COVID-19 , Prueba de COVID-19 , Infecciones por Coronavirus/diagnóstico , Disnea/diagnóstico por imagen , Disnea/virología , Femenino , Humanos , Hipertrofia/diagnóstico por imagen , Hipertrofia/virología , India , Pulmón/diagnóstico por imagen , Masculino , Persona de Mediana Edad , Pandemias , Estudios Prospectivos , SARS-CoV-2 , Taquipnea/diagnóstico por imagen , Taquipnea/virología , Tórax/diagnóstico por imagen , Tomografía Computarizada por Rayos X/métodos , Adulto JovenRESUMEN
An 80-year-old man with multiple comorbidities presented to the emergency department with tachypnea, tachycardia, fever, and critically low O2 saturation and definitive chest computerized tomography scan findings in favor of COVID-19 and positive PCR results in 48 hours. He received antiviral treatment plus recombinant human erythropoietin (rhEPO) due to his severe anemia. After 7 days of treatment, he was discharged with miraculous improvement in his symptoms and hemoglobin level. We concluded that rhEPO could attenuate respiratory distress syndrome and confront the severe acute respiratory syndrome coronavirus 2 virus through multiple mechanisms including cytokine modulation, antiapoptotic effects, leukocyte release from bone marrow, and iron redistribution away from the intracellular virus.
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Anemia/tratamiento farmacológico , Infecciones por Coronavirus/tratamiento farmacológico , Eritropoyetina/uso terapéutico , Fiebre/tratamiento farmacológico , Neumonía Viral/tratamiento farmacológico , Taquicardia/tratamiento farmacológico , Taquipnea/tratamiento farmacológico , Anciano de 80 o más Años , Anemia/complicaciones , Anemia/diagnóstico , Anemia/virología , Antivirales/uso terapéutico , Betacoronavirus/efectos de los fármacos , Betacoronavirus/genética , Betacoronavirus/patogenicidad , Biomarcadores/sangre , COVID-19 , Prueba de COVID-19 , Técnicas de Laboratorio Clínico/métodos , Convalecencia , Infecciones por Coronavirus/complicaciones , Infecciones por Coronavirus/diagnóstico , Infecciones por Coronavirus/virología , Enfermedad Crítica , Fiebre/complicaciones , Fiebre/diagnóstico , Fiebre/virología , Humanos , Irán , Masculino , Pandemias , Neumonía Viral/complicaciones , Neumonía Viral/diagnóstico , Neumonía Viral/virología , ARN Viral/sangre , ARN Viral/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , SARS-CoV-2 , Taquicardia/complicaciones , Taquicardia/diagnóstico , Taquicardia/virología , Taquipnea/complicaciones , Taquipnea/diagnóstico , Taquipnea/virología , Tomografía Computarizada por Rayos X , Resultado del TratamientoRESUMEN
To evaluate host susceptibility factors to Middle East respiratory syndrome coronavirus (MERS-CoV) infection, we conducted a retrospective cohort study from the single largest exposure event of the 2015 Korean MERS outbreak. A total of 175 patients were closely exposed to a super-spreader, 26 of which were infected (14.9%). In a multivariate analysis, history of autologous stem cell transplantation (HR, 31.151; 95% CI, 5.447-178.145; P < 0.001) and tachypnea at ED (HR, 4.392; 95% CI, 1.402-13.761; P = 0.011) were significantly associated with MERS-CoV infection.
Asunto(s)
Infecciones por Coronavirus/epidemiología , Infecciones por Coronavirus/virología , Brotes de Enfermedades , Interacciones Huésped-Patógeno , Coronavirus del Síndrome Respiratorio de Oriente Medio/aislamiento & purificación , Adulto , Anciano , Estudios de Cohortes , Susceptibilidad a Enfermedades/epidemiología , Susceptibilidad a Enfermedades/virología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Análisis Multivariante , República de Corea/epidemiología , Estudios Retrospectivos , Factores de Riesgo , Trasplante de Células Madre , Taquipnea/epidemiología , Taquipnea/virología , Trasplante AutólogoRESUMEN
OBJECTIVES: To describe the clinical manifestations and short-term outcomes of adenoviral infections in neonates and review all published cases to better determine impact and treatment outcomes. STUDY DESIGN: Retrospective cohort study of all neonates hospitalized at Children's Medical Center (CMC) and Parkland Memorial Hospital (PMH), Dallas, TX with laboratory-confirmed adenoviral infection from January 1,1995-December 31, 2012. Neonates were identified by review of the CMC Virology Laboratory's prospective database of all positive adenovirus tests performed in the inpatient and ambulatory settings, and at PMH, of a prospective neonatal database that included all neonatal intensive care unit admissions. Patients also were identified by discharge International Classification of Disease, 9th edition codes for adenoviral infection. The medical records were reviewed, and a review of the English literature was performed. RESULTS: During 17 years, 26 neonates had adenoviral infection (25, CMC; 1, PMH). The principle reasons for hospitalization were respiratory signs (88%) and temperature instability (65%). Five (19%) had disseminated disease and 4 (80%) of these infants died. Ribavirin or cidofovir treatment, as well as immune globulin intravenous, did not improve outcomes except in 1 neonate. Literature review (n = 72) combined with our data found that disseminated infection was associated with death (68% vs 21% with localized infection, P < .001). In addition, neonates <14 days of age were more likely to have disseminated disease (44% vs 12%, P = .004) and death (48% vs 8%; P < .001). CONCLUSION: Adenoviral infection in hospitalized neonates was associated with severe morbidity and mortality, especially when infection was disseminated and involved the respiratory tract. Development of new therapeutic strategies is needed.