Anticorpos contra Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae e vírus da influenza e suas relações com fatores de risco, sinais clínicos e lesões pulmonares em suínos no Estado de São Paulo
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Data
2018-06-22
Autores
Baraldi, Thaís Gasparini
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Foi realizado um estudo em 21 granjas de suínos de ciclo completo para avaliar as relações entre os resultados sorológicos de patógenos envolvidos em doenças respiratórias, Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae e vírus da influenza suína, e índice de tosse, escore de pneumonia e pleurite. A amostragem para testes sorológicos foi realizada em suínos de creche, crescimento, terminação e abate e exame de tosse em animais crescimento e terminação. Análises de lesões de consolidação pulmonar sugestivas de pneumonia enzoótica e pleurite foram realizadas no abate. As características dos rebanhos foram acessadas por um formulário aplicado aos produtores. Títulos de anticorpos contra o Mycoplasma hyopneumoniae e vírus da influenza suína aumentaram durante as fases de criação, com maiores prevalências em suínos abatidos (> 40%), por outro lado, a maioria dos rebanhos (14/21) não apresentaram nenhum animal soropositivo para Actinobacillus pleuropneumoniae nesta idade. Lesões de pleurite e de consolidação pulmonar foram registradas em 9,03% e 72,4% dos 908 pulmões avaliados, respectivamente. As análises histopatologicas das lesões pulmonares de consolidação revelaram broncopneumonia supurativa em quase metade dos pulmões (48,9%). Análises de regressão foram realizadas para identificar fatores de risco de índice de tosse, pleurite, lesões de consolidação pulmonar e resultados sorológicos de Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae e vírus da influenza suína. A soroprevalência de Mycoplasma hyopneumoniae associou-se ao uso do manejo all-in-all-out em barracões de creche, a soroprevalência de Actinobacillus pleuropneumoniae associou-se à pleurite, e a presença de índice de tosse em suínos em crescimento associou-se à soropositividade de influenza suína em leitões de creche.
A study was carried out in 21 one-site production system in southeast Brazilian pig herds to assess the relationships between serological results of pathogens involved in respiratory diseases, Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae and swine influenza virus, cough index, pneumonia score and pleuritis. Sampling for serological tests were carried out at nursering, growing, finishing and slaughtered pigs, and cough examination on growing and finishing pigs. Analyses of cranio-ventral consolidation lesions (EP-like lesions) suggestive of enzootic pneumonia and pleuritis were performed at slaughter. Herd characteristics were obtained using questionnaire asked to farmers. Antibody titers to Mycoplasma hypneumoniae and swine influenza virus increased throughout the raising phases with higher prevalence in slaughtered pigs (> 40%). On the other hand Actinobacillus pleuropneumoniae presented most of herds (14/21) with no seropositive animal. Pleuritis lesions and EP-like lesions were recorded in 9.03% and 72.4% of 908 evaluated lungs, respectively. The hystopatological of EP-lung lesions reveled suppurative bronchopneumonia in almost half of lungs (48.9%). Regression analysis were conducted to identify risk factors for cough index, pleuritis, EP-like lesions, serological results. Mycoplasma hyopneumoniae seroprevalence was associated with use of all-in-all-out management in nursery pigs, Actinobacillus pleuropneumoniae seroprevalence were associated with pleuritis and the presence of cough index in growing pigs associated with swine influenza seropositivity in nursery pigs.
A study was carried out in 21 one-site production system in southeast Brazilian pig herds to assess the relationships between serological results of pathogens involved in respiratory diseases, Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae and swine influenza virus, cough index, pneumonia score and pleuritis. Sampling for serological tests were carried out at nursering, growing, finishing and slaughtered pigs, and cough examination on growing and finishing pigs. Analyses of cranio-ventral consolidation lesions (EP-like lesions) suggestive of enzootic pneumonia and pleuritis were performed at slaughter. Herd characteristics were obtained using questionnaire asked to farmers. Antibody titers to Mycoplasma hypneumoniae and swine influenza virus increased throughout the raising phases with higher prevalence in slaughtered pigs (> 40%). On the other hand Actinobacillus pleuropneumoniae presented most of herds (14/21) with no seropositive animal. Pleuritis lesions and EP-like lesions were recorded in 9.03% and 72.4% of 908 evaluated lungs, respectively. The hystopatological of EP-lung lesions reveled suppurative bronchopneumonia in almost half of lungs (48.9%). Regression analysis were conducted to identify risk factors for cough index, pleuritis, EP-like lesions, serological results. Mycoplasma hyopneumoniae seroprevalence was associated with use of all-in-all-out management in nursery pigs, Actinobacillus pleuropneumoniae seroprevalence were associated with pleuritis and the presence of cough index in growing pigs associated with swine influenza seropositivity in nursery pigs.
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Palavras-chave
Suínos, Fatores de risco, Pneumonia enzoótica, Pleurite, Doenças respiratórias, Pigs, Risk factors, Enzootic pneumonia, Pleuritis, Respiratory diseases