RESUMO

Este estudo teve como objetivo caracterizar genótipos de M. synoviae circulantes em poedeiras comerciais, na Região Sudeste do Brasil. Para estabelecer a relação evolutiva entre as cepas de MS, foi analisada a sequência genética do gene vlhA de 11 cepas de MS identificadas no Rio de Janeiro e em São Paulo, de 10 outras cepas de MS identificadas no Brasil e cujas sequências foram depositadas no banco de dados GenBank, e da cepa vacinal MSH. O método da máxima verossimilhança e o modelo de Kimura com dois parâmetros foram utilizados para comparar as cepas. As sequências obtidas foram depositadas no Genbank, sob os números de acesso OP279775 a OP279785. Foi possível verificar a presença de diferentes cepas circulantes no Brasil, com alta similaridade entre as cepas do Rio de Janeiro pela análise do gene vlhA. As duas cepas paulistas detectadas no presente estudo possuem o baixo percentual (68%) de similaridade, demonstrando a variabilidade das cepas dessa localidade.

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1. This study evaluated the minimal inhibitory concentration (MIC) of ciprofloxacin and the presence of plasmid-mediated quinolone resistance (PMQR) mechanisms in 97 nontyphoidal Salmonella spp. isolated from broilers and carcases from three different regions in Brazil. The presence of mutations in quinolone resistance determination regions (QRDRS) was investigated in the ciprofloxacin-resistant strain by DNA sequencing.2. Most of the Salmonella spp. (85.6%) had intermediate resistance to ciprofloxacin and only one isolate was resistant. MIC breakpoints ranged from ≤0.03 to 1 µg/ml and 67.0% of the strains had a MIC of 0.25 µg/ml (n=65). Thirteen strains (13.4%) were susceptible to ciprofloxacin with MIC ≤0.06 µg/ml. The qnrB gene was detected in eight isolates with intermediate resistance and in two susceptible strains. The other PMQR genes, qnrA, qnrC, qnrD, qnrS, qnrVC, aac(6')-Ib, qepA, oqxAB and mutations in QRDR were not detected in any strain.3. There was a high frequency of ciprofloxacin intermediate resistant Salmonella from broiler and broiler carcases from Brazil. The presence of these strains in poultry and derived products poses a risk to public health.

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Enteropatogenic Escherichia coli (EPEC) and shigatoxigenic E. coli (STEC), are generally poultry and poultry product isolate and can cause serious human infections. Many strains may become resistant to various antimicrobials, which can hinder the treatment of bacterial diseases. Organic farming seeks to avoid the selection and frequency of antimicrobial-resistant bacteria. This study aims to verify the resistance of EPEC and STEC from organic and conventional (industrial) broiler isolates to antimicrobials. All isolates were submitted to disk diffusion test with tetracycline, gentamicin, enrofloxacin, ceftriaxone and amoxicillin + clavulanate (TET, GEN, ENO, CTX, AMC) and PCR to detect specific virulence genes for EPEC and STEC. A total of 297 E. coli strains were isolated, 213 from conventional. In organic broiler, 84 strains were isolated. The strains from the conventional broiler isolates were resistant to five antimicrobials tested: TET 48.82% (104/213), ENO 28.17% (60/213), CTX 15.49% (33/213), GEN 14.55% (31/213), and AMC 7.04% (15/213), and 9.86% (21/213) were considered multidrug-resistant. Organic chicken strains were resistant to four of the antimicrobials tested: TET 35.7% (30/84), ENO 9.5% (8/84), CTX 2.4% (2/84), GEN 4.8% (4/84). Of the strains from the organic broiler chicken isolates, only 1.2% (1/84) was considered multidrug-resistant. No EPEC and STEC were found in the organic chicken samples. The multidrug resistance was characterized in 9.52% (2/21) of the EPEC and 4.76% (1/21) of the STEC. The study demonstrated the absence of EPEC and STEC strains in organic broilers and carcasses and a lower frequency of multiresistant strains compared to conventional breeding.(AU)

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Salmonellosis is an important gastrointestinal infection in humans and cause of foodborne outbreaks in the world. In this context, molecular characterization is essential to understand how the strains circulate. The aim of this study was to evaluate the genotypic distribution of S. Heidelberg according to the source of isolation. The genetic relatedness of the S. Heidelberg isolates was determined by pulsed-field gel electrophoresis (PFGE). The most prevalent pulsotypes of cluster A were BRJF6X01.006 (27/95 = 28,42%) related between 1995 and 2011 in broilers, poultry meat and poultry farms, meat product and human, and BRJF6X01.001 (21/95 = 22,10%) related between 2011 and 2017 in wild animals, broilers, poultry meat, poultry farms, meat product, animal feed, and pork meat. The pulsotype BRJF6X01.001 shows a high distribution in the environmental and productive chain. The degree of similarity between pulsotypes BRJF6X01.006 and BRJF6X01.001 is 88%. To ensure the safety of human and animal health, holistic approaches, including surveillance of Salmonella throughout the environment and in the production chain, together with control measures, are critical. As transmission of Salmonella from food producing animals to wildlife and to the environment is considered potential public health problem, information on the survival and persistence of Salmonella in the environment and in potential reservoirs is of considerable importance.(AU)

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The control of Salmonella in the poultry production chain combined with biosecurity measures is an important tool to maintain and guarantee the sanitary status of Brazilian flocks. The aim of this work was to compare official laboratory data on molecular typification of Salmonella isolates from poultry breeding flocks in different Brazilian states between 2016 and 2018 and identify the production category with the most positive flocks, in light of current legislation. Surveillance data of positive samples from the official Brazilian Salmonella Control Programme sent to Federal Agricultural Defence Laboratory of São Paulo (LFDA-SP) after molecular characterization were analysed. These data were subject to an exploratory study, undergoing a descriptive statistical analysis followed by the use of frequency and non-parametric hypothesis tests. Overall, 49 serovars were detected in poultry broiler-breeder and layer-breeder flocks. Salmonella ser. Heidelberg, Salmonella ser. Anatum, Salmonella ser. Newport, Salmonella ser. Schwarzengrund and Salmonella ser. Mbandaka were the five most common isolated serovars. The data shows that there is an opportunity to improve biosecurity measures in parent breeder flocks. A total of 16 serovars were identified in turkey-breeders. Salmonella ser. Anatum, Salmonella ser. Newport, Salmonella ser. Brandenburg, Salmonella ser. Litchfield, and Salmonella ser. Livingstone were the most common ones. The four official controlled serovars represented a small part of the isolated strains. These data demonstrate the importance of an official program in Brazil for Salmonella surveillance in breeder flocks combined with biosecurity measures.(AU)

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1. The aim of this study was to compare the resistance pattern of thermophilic Campylobacter spp. isolated from conventional production (n = 34) and backyard poultry flocks (n = 36) from Rio de Janeiro State, Brazil. The disc diffusion method and statistical tests were used for investigation and analysis of the resistance pattern of Campylobacter spp. isolated from different rearing systems.2. Antimicrobial resistance percentages to amoxycillin with clavulanic acid (AMC), ampicillin (AMP), ceftiofur (CTF), ciprofloxacin (CIP), enrofloxacin (ENO), erythromycin (ERI), gentamicin (GEN) and tetracycline (TET) were 32.4%, 44.1%, 67.6%, 97.1%, 82.4%, 26.5%, 5.9% and 38.2% in conventional production flocks respectively, while the backyard flock's resistance levels were 0.0%, 13.9%, 69.4%, 100.0%, 91.7%, 5.6%, 0.0% and 16.7%, respectively.3. Campylobacter spp. from conventional poultry production was more resistant to AMC, AMO, ERI and TET (P > 0.05) when compared to strains from backyard poultry. A higher frequency of resistance to fluoroquinolones (FLQ), CIP and ENO, was observed in strains from both systems, demonstrating the spread of resistant strains among poultry production environments.

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The present study aimed to investigate the occurrence of Mycoplasma synoviae (MS), M. gallisepticum (MG), Ornitobacterium rhinotracheale (OR), Avibacterium paragallinarum (AP), Pasteurella multocida (PM) and Infectious Bronchitis Virus (IBV) in laying hens with respiratory clinical signs in two phases of production. 140 tracheal swabs and 140 blood samples were collected from laying hens in the rearing and production phases, the chickens belonged to six farms (A-F) located in the state of São Paulo, Brazil. The samples were analyzed by PCR for MG, MS, OR, AP, PM and IBV and by ELISA for MG and MS. The highest frequencies observed by PCR were for MS at farms B and C with 95 and 100% positivity, followed by MG at farms D and E with 35% and 65%, IBV with 35% at farm F and ORT with 15% at farm A. All flocks were positive for MG and MS in serology. Although MG and IBV have been detected, this can be explained by the vaccination protocols, since live attenuated vaccines are widely used for immunization against these pathogens. It was also possible to detect OR and AP thorugh PCR in some flocks. The occurrence of several etiological agents that cause respiratory diseases in laying hens was confirmed by PCR and serology, with MS being the most prevalent and being present in all farms studied.(AU)

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The present study aimed to investigate the occurrence of Mycoplasma synoviae (MS), M. gallisepticum (MG), Ornitobacterium rhinotracheale (OR), Avibacterium paragallinarum (AP), Pasteurella multocida (PM) and Infectious Bronchitis Virus (IBV) in laying hens with respiratory clinical signs in two phases of production. 140 tracheal swabs and 140 blood samples were collected from laying hens in the rearing and production phases, the chickens belonged to six farms (A-F) located in the state of São Paulo, Brazil. The samples were analyzed by PCR for MG, MS, OR, AP, PM and IBV and by ELISA for MG and MS. The highest frequencies observed by PCR were for MS at farms B and C with 95 and 100% positivity, followed by MG at farms D and E with 35% and 65%, IBV with 35% at farm F and ORT with 15% at farm A. All flocks were positive for MG and MS in serology. Although MG and IBV have been detected, this can be explained by the vaccination protocols, since live attenuated vaccines are widely used for immunization against these pathogens. It was also possible to detect OR and AP thorugh PCR in some flocks. The occurrence of several etiological agents that cause respiratory diseases in laying hens was confirmed by PCR and serology, with MS being the most prevalent and being present in all farms studied.

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O objetivo deste trabalho foi estudar a prevalência de MG e MS e a filogenia das cepas circulantes, comparando-as com outras já descritas em poedeiras comerciais no Brasil. Foram coletados 140 suabes traqueais de poedeiras comerciais com sinais respiratórios em seis granjas da região centro-oeste de São Paulo. As amostras foram avaliadas por PCR, com posterior sequenciamento e análise filogenética das cepas identificadas. Das 140 amostras, 16,4% foram positivas para MG e 68,6% para MS. Houve diferença significativa nas frequências de MG e MS por granja, segundo o teste G de independência (P<0,05). Todas as cepas identificadas de MG e MS de granjas distintas apresentaram similaridade tanto pela lipoproteína para MG quanto pela região 16s rRNA para MS. Neste estudo, foi possível observar altas prevalências dos agentes estudados, sendo a de MS maior que a de MG. Foi detectada infecção mista por MG e MS em 11,4% das amostras e sabe-se que esses micoplasmas podem agir de forma sinérgica, agravando o quadro respiratório. As cepas circulantes identificadas, pela análise das regiões gênicas da lipoproteína para MG e 16S rRNA para MS, são similares em todas as granjas estudadas.(AU)

The aim of this study was to evaluate the prevalence of MG and MS and the phylogeny of the circulating strains, comparing them with others already described in commercial laying hens from Brazil. A total of 140 tracheal swabs were collected from commercial laying hens with respiratory signs in six farms from the western region of São Paulo state. The samples were analyzed by PCR with subsequent sequencing and phylogenetic analysis of the identified strains. From the 140 samples, 68.6% were positive for MS and 16.4% for MG. There was a significant difference in the frequencies of MG and MS per farm according to G Test of independence (P<0.05). All strains identified as MG and MS from distinct farms presented similarity both by lipoprotein to MG and by 16s rRNA region to MS. In this study, it was possible to observe a high prevalence of MS compared to MG. Mixed MG and MS infection was detected in 11.4% of the samples. These mycoplasmas may act synergistically, worsening the respiratory signs. The circulating strains identified by analysis of the lipoprotein for MG and 16S rRNA for MS are similar on all poultry farms studied.(AU)

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RESUMO

O objetivo deste trabalho foi estudar a prevalência de MG e MS e a filogenia das cepas circulantes, comparando-as com outras já descritas em poedeiras comerciais no Brasil. Foram coletados 140 suabes traqueais de poedeiras comerciais com sinais respiratórios em seis granjas da região centro-oeste de São Paulo. As amostras foram avaliadas por PCR, com posterior sequenciamento e análise filogenética das cepas identificadas. Das 140 amostras, 16,4% foram positivas para MG e 68,6% para MS. Houve diferença significativa nas frequências de MG e MS por granja, segundo o teste G de independência (P<0,05). Todas as cepas identificadas de MG e MS de granjas distintas apresentaram similaridade tanto pela lipoproteína para MG quanto pela região 16s rRNA para MS. Neste estudo, foi possível observar altas prevalências dos agentes estudados, sendo a de MS maior que a de MG. Foi detectada infecção mista por MG e MS em 11,4% das amostras e sabe-se que esses micoplasmas podem agir de forma sinérgica, agravando o quadro respiratório. As cepas circulantes identificadas, pela análise das regiões gênicas da lipoproteína para MG e 16S rRNA para MS, são similares em todas as granjas estudadas.(AU)

The aim of this study was to evaluate the prevalence of MG and MS and the phylogeny of the circulating strains, comparing them with others already described in commercial laying hens from Brazil. A total of 140 tracheal swabs were collected from commercial laying hens with respiratory signs in six farms from the western region of São Paulo state. The samples were analyzed by PCR with subsequent sequencing and phylogenetic analysis of the identified strains. From the 140 samples, 68.6% were positive for MS and 16.4% for MG. There was a significant difference in the frequencies of MG and MS per farm according to G Test of independence (P<0.05). All strains identified as MG and MS from distinct farms presented similarity both by lipoprotein to MG and by 16s rRNA region to MS. In this study, it was possible to observe a high prevalence of MS compared to MG. Mixed MG and MS infection was detected in 11.4% of the samples. These mycoplasmas may act synergistically, worsening the respiratory signs. The circulating strains identified by analysis of the lipoprotein for MG and 16S rRNA for MS are similar on all poultry farms studied.(AU)

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The present study aimed to investigate, by culture and PCR, the occurrence of Mollicutes, Mycoplasma gallisepticum and Mycoplasma synoviae in free-living Muscovy-ducks (Cairina moschata) from the Rio Zoo, RJ, Brazil. Tracheal swabs were obtained from 82 asymptomatic ducks and the samples were submitted to culture of mycoplasmas and PCR for identification of Mollicutes Class, Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS). Samples were also analyzed directly by PCR, without prior culture, for Mollicutes, MG and MS. Eighteen (18/82) Muscovy-ducks were positive for Mollicutes by culture, all isolates were confirmed as Mollicutes and seven were identified as MG. Of the samples analyzed directly by PCR, without prior culture, 17,1% (14/82) was positive for Mollicutes, being 35,7% (5/14) identified as MG and 21,4% (3/14) as MS. The occurrence of Mollicutes class bacteria was detected in Muscovy-ducks. MG and MS were identified in these animals suggesting the circulation of these agents in the Rio de Janeiro Zoo and may present a risk for the health status of the other birds.(AU)

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The extensive use of antimicrobial agents has contributed to the emergence of antimicrobial resistance and multidrug resistance (MDR) in Salmonella, an important zoonotic pathogen that causes outbreaks and sporadic cases of gastroenteritis in humans. The study aimed to investigate the antimicrobial resistance profile of Salmonella strains isolated from poultry in Brazil. A total of 230 Salmonella strains, isolated from cloacal swabs (n=56) and broiler carcasses swabs (n=174) before and after chilling from slaughterhouses under Federal Inspection Service within the period 2012-2017, were analyzed. Serotyping and antibiotic susceptibility testing were performed on all the isolates. Serotyping results showed that 41% of the strains were Salmonella Heidelberg, 29% S. Minnesota, 12% S. Saintpaul, 6.5% S. Enteritidis, 3.9% S. Anatum, 2.2% S. Cerro, 2.2% S. Senftenberg, 1.7% S. Newport, 0.4% S. Ealing, 0.4% S. O:4,5 and 0.4% S. O:9,12. MDR rates of the isolates were 67.4%. S. Heidelberg 89.5%, S. Minnesota 51.5%, S. Saintpaul 82.1%, S. Anatum 66.7%, S. Cerro 60%, S. Senftenberg 40%. Out of the 230 strains, 41.3% presented resistance to Penicillins + beta-lactamase inhibitor, Penicillin, 1st and 2nd Generation Cephalosporin, 3rd and 4th Generation Cephalosporin, Tetracycline and Sulfonamide. Salmonella Heidelberg, S. Saintpaul, S. Anatum, S. Cerro, S. Senftenberg and S. Minnesota were isolated after chilling tank highlighting a food safety concern for the industry of poultry and poultry products indicating a risk to collective health. The high prevalence of MDR nontyphoidal Salmonella obtained in this study limit the options available to treat infectious disease in humans and animals.(AU)

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The present study aimed to investigate, by culture and PCR, the occurrence of Mollicutes, Mycoplasma gallisepticum and Mycoplasma synoviae in free-living Muscovy-ducks (Cairina moschata) from the Rio Zoo, RJ, Brazil. Tracheal swabs were obtained from 82 asymptomatic ducks and the samples were submitted to culture of mycoplasmas and PCR for identification of Mollicutes Class, Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS). Samples were also analyzed directly by PCR, without prior culture, for Mollicutes, MG and MS. Eighteen (18/82) Muscovy-ducks were positive for Mollicutes by culture, all isolates were confirmed as Mollicutes and seven were identified as MG. Of the samples analyzed directly by PCR, without prior culture, 17,1% (14/82) was positive for Mollicutes, being 35,7% (5/14) identified as MG and 21,4% (3/14) as MS. The occurrence of Mollicutes class bacteria was detected in Muscovy-ducks. MG and MS were identified in these animals suggesting the circulation of these agents in the Rio de Janeiro Zoo and may present a risk for the health status of the other birds.

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The present study investigated the frequency, level of contamination and serotyping of Salmonella strains isolated from broiler flocks in different processing sites and the fulfillment of a Performance Objective (PO) in frozen chicken breasts, as a risk assessment to measure the efficacy of prevention and control programs applied to reduce the risk of Salmonella spp. in raw poultry meat that contribute to reach food safety and public health goals. From 1,800 samples of cloacal swabs, carcasses before and after immersion chilling and frozen breasts derived from 20 broiler flocks slaughtered at two processing plants located in the mid-west and southern regions of Brazil, 278 samples were positive for Salmonella spp. by polymerase chain reaction (PCR) automated BAX System (DUPONT QUALICOM, USA), and 118 were enumerated by miniaturized most probable number technique. 122 Salmonella spp. strains were serotyped at the National Reference Laboratory of Cholera and Enteric Diseases of Oswaldo Cruz Institute Foundation (FIOCRUZ), showing a dominance of Salmonella Minnesota in every processing steps of the slaughterhouse located in the Brazilian mid-west region. Only 1 lot failed to reach the expected result for the Performance Objective (PO), using a maximum of 10% positivity acceptance for Salmonella spp. in frozen chicken breasts. Qualitative and quantitative results combined may be considered an effective tool to evaluate the effect of prevention and control programs for Salmonella spp. on the safety of the final product.(AU)

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RESUMO

The extensive use of antimicrobial agents has contributed to the emergence of antimicrobial resistance and multidrug resistance (MDR) in Salmonella, an important zoonotic pathogen that causes outbreaks and sporadic cases of gastroenteritis in humans. The study aimed to investigate the antimicrobial resistance profile of Salmonella strains isolated from poultry in Brazil. A total of 230 Salmonella strains, isolated from cloacal swabs (n=56) and broiler carcasses swabs (n=174) before and after chilling from slaughterhouses under Federal Inspection Service within the period 2012-2017, were analyzed. Serotyping and antibiotic susceptibility testing were performed on all the isolates. Serotyping results showed that 41% of the strains were Salmonella Heidelberg, 29% S. Minnesota, 12% S. Saintpaul, 6.5% S. Enteritidis, 3.9% S. Anatum, 2.2% S. Cerro, 2.2% S. Senftenberg, 1.7% S. Newport, 0.4% S. Ealing, 0.4% S. O:4,5 and 0.4% S. O:9,12. MDR rates of the isolates were 67.4%. S. Heidelberg 89.5%, S. Minnesota 51.5%, S. Saintpaul 82.1%, S. Anatum 66.7%, S. Cerro 60%, S. Senftenberg 40%. Out of the 230 strains, 41.3% presented resistance to Penicillins + beta-lactamase inhibitor, Penicillin, 1st and 2nd Generation Cephalosporin, 3rd and 4th Generation Cephalosporin, Tetracycline and Sulfonamide. Salmonella Heidelberg, S. Saintpaul, S. Anatum, S. Cerro, S. Senftenberg and S. Minnesota were isolated after chilling tank highlighting a food safety concern for the industry of poultry and poultry products indicating a risk to collective health. The high prevalence of MDR nontyphoidal Salmonella obtained in this study limit the options available to treat infectious disease in humans and animals.

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RESUMO

The present study investigated the frequency, level of contamination and serotyping of Salmonella strains isolated from broiler flocks in different processing sites and the fulfillment of a Performance Objective (PO) in frozen chicken breasts, as a risk assessment to measure the efficacy of prevention and control programs applied to reduce the risk of Salmonella spp. in raw poultry meat that contribute to reach food safety and public health goals. From 1,800 samples of cloacal swabs, carcasses before and after immersion chilling and frozen breasts derived from 20 broiler flocks slaughtered at two processing plants located in the mid-west and southern regions of Brazil, 278 samples were positive for Salmonella spp. by polymerase chain reaction (PCR) automated BAX System (DUPONT QUALICOM, USA), and 118 were enumerated by miniaturized most probable number technique. 122 Salmonella spp. strains were serotyped at the National Reference Laboratory of Cholera and Enteric Diseases of Oswaldo Cruz Institute Foundation (FIOCRUZ), showing a dominance of Salmonella Minnesota in every processing steps of the slaughterhouse located in the Brazilian mid-west region. Only 1 lot failed to reach the expected result for the Performance Objective (PO), using a maximum of 10% positivity acceptance for Salmonella spp. in frozen chicken breasts. Qualitative and quantitative results combined may be considered an effective tool to evaluate the effect of prevention and control programs for Salmonella spp. on the safety of the final product.

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O presente trabalho teve como objetivo identificar e classificar a pododermatite em frangos de corte, comparando as lesões microscópicas com os aspectos macroscópicos utilizados pela inspeção sanitária. Foi realizada coleta de pés de frangos de corte, em matadouro de aves sob inspeção sanitária, após classificação utilizada nos padrões para exportação. Foram coletados 30 pés tipo A, 30 pés tipo B e 33 pés tipo C, escolhidos aleatoriamente dentro de cada grupo. Para análise histopatológica, foram desenvolvidos escores de acordo com a gravidade das lesões, variando de 0 a 2. Foi observada associação (qui-quadrado, P<0,05) entre a classificação macroscópica (A, B e C) e as alterações histológicas (0, 1 e 2). A classificação A diferiu significativamente (ANOVA, Tukey-Kramer, P<0,05) das classificações B e C quanto aos escores histopatológicos observados. Não houve diferença no comprometimento dos pés pelas lesões que justificassem a separação entre os pés classificados em B e C, uma vez que ambos apresentaram delimitação linear das lesões, sugerindo superficialidade e restrição ao epitélio queratinizado. Portanto, sugere-se o aproveitamento dos pés para consumo humano após remoção mecânica do "calo de pé", uma vez que este produto não oferece riscos ao consumidor.(AU)

The aim of this study was to identify and classify pododermatitis in broilers, comparing the microscopic lesions with the macroscopic aspects used by the Sanitary Inspection. Broiler chicken feet were collected at a Poultry slaughterhouse under Sanitary Inspection, after classification according to the exportation standards. The chicken feet were randomly selected in each group, 30 feet type A, 30 feet type B and 33 feet type C. For the histopathological analysis, scores were developed according to the severity of the lesions, varying from 0 to 2. There was association (Chi-square, P< 0.05) between the macroscopic classification (A, B and C) and histological changes (0, 1 and 2). The A classification differed significantly (ANOVA, Tukey-Kramer, P< 0.05) from the B and C classifications regarding the histopathological scores observed. There was no difference in feet lesions that justified the separation between the feet classified in B and C, since both presented a linear delimitation of the lesions, suggesting superficiality and restriction to the keratinized epithelium. Therefore, the use of the feet for human consumption after mechanical removal of the footpad lesions is suggested since the product does not pose risks to the consumer.(AU)

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RESUMO

O presente trabalho teve como objetivo identificar e classificar a pododermatite em frangos de corte, comparando as lesões microscópicas com os aspectos macroscópicos utilizados pela inspeção sanitária. Foi realizada coleta de pés de frangos de corte, em matadouro de aves sob inspeção sanitária, após classificação utilizada nos padrões para exportação. Foram coletados 30 pés tipo A, 30 pés tipo B e 33 pés tipo C, escolhidos aleatoriamente dentro de cada grupo. Para análise histopatológica, foram desenvolvidos escores de acordo com a gravidade das lesões, variando de 0 a 2. Foi observada associação (qui-quadrado, P<0,05) entre a classificação macroscópica (A, B e C) e as alterações histológicas (0, 1 e 2). A classificação A diferiu significativamente (ANOVA, Tukey-Kramer, P<0,05) das classificações B e C quanto aos escores histopatológicos observados. Não houve diferença no comprometimento dos pés pelas lesões que justificassem a separação entre os pés classificados em B e C, uma vez que ambos apresentaram delimitação linear das lesões, sugerindo superficialidade e restrição ao epitélio queratinizado. Portanto, sugere-se o aproveitamento dos pés para consumo humano após remoção mecânica do "calo de pé", uma vez que este produto não oferece riscos ao consumidor.(AU)

The aim of this study was to identify and classify pododermatitis in broilers, comparing the microscopic lesions with the macroscopic aspects used by the Sanitary Inspection. Broiler chicken feet were collected at a Poultry slaughterhouse under Sanitary Inspection, after classification according to the exportation standards. The chicken feet were randomly selected in each group, 30 feet type A, 30 feet type B and 33 feet type C. For the histopathological analysis, scores were developed according to the severity of the lesions, varying from 0 to 2. There was association (Chi-square, P< 0.05) between the macroscopic classification (A, B and C) and histological changes (0, 1 and 2). The A classification differed significantly (ANOVA, Tukey-Kramer, P< 0.05) from the B and C classifications regarding the histopathological scores observed. There was no difference in feet lesions that justified the separation between the feet classified in B and C, since both presented a linear delimitation of the lesions, suggesting superficiality and restriction to the keratinized epithelium. Therefore, the use of the feet for human consumption after mechanical removal of the footpad lesions is suggested since the product does not pose risks to the consumer.(AU)

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Mycoplasma gallisepticum causes coughing, ocular and nasal discharge, reduction in feed intake, lower and uneven growth, decline in egg production and quality, and increase in mortality. Among the attenuated vaccination strains, MGF can reduce clinical signs and lesions in layer hens, stimulate immune responses of cellular and humoral basis, act as an instrument of competitive exclusion in relation to field strains, and reduce the use of antimicrobials. This study aimed to investigate the effects of attenuated MG F-strain vaccination on egg quality in 3 groups of 30 hens each, being one control and 2 vaccinated. Vaccination was applied by ocular route at 8 and 12 wk of age. Comparisons were made among unvaccinated hens; vaccinated at 8 wk of age; and vaccinated at 8 and 12 wk of age. There were no statistical differences in eggshell thickness and weight among groups. Eggs from twice vaccinated birds yielded a Haugh unit significantly lower than the other groups without affecting egg classification. There was no significant difference in ELISA results between the vaccinated groups.

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The present study investigated the effectiveness of a single Salmonella prevention and control program applied in two different processing plants, located in the states of Mato Grosso do Sul (plant A) and Santa Catarina (Plant B), belonging to the same company, and identified Salmonella strain subtypes isolated from broilers, carcasses before and after chilling, and frozen chicken breasts. The Salmonella prevention and control program was 90% effective in plant A and 100% in plant B, considering a level of 10% positive samples per frozen chicken breast batch acceptable. A total of 128 strains were serotyped, being 10 from drag swabs, 31 from cloacal swabs, 83 from carcasses, and 4 from frozen chicken breasts. After serotyping analysis, 30 strains isolated at different processing steps and drag swabs, and three Salmonella Minnesota strains isolated in 2012 in plant A, were genotyped by PFGE. In plant A, the most frequently strain isolated was Salmonella Minnesota (90.35%), followed by Salmonella Newport (8.77%), and in Plant B, Salmonella Senftenberg (80%). Salmonella Minnesota strains were differentiated by PFGE into 19 pulsotypes distributed in three clusters. The phenotypic identification by serotyping of four strains diverged from their PFGE genotypic results. Most Salmonella Minnesota strains genotyped in plant A and the strains isolated from environmental samples in 2012 in the same broiler processing plant belong to a single cluster, confirming the dominance and persistence of this clone over time.(AU)

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