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Poliserosite, artrite e doença respiratória em leitões: estudo de caso
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Advisor(s)
Abstract(s)
O complexo da poliserosite em suínos é causado por múltiplos factores, em particular pelo agente Haemophilus parasuis (HPS), que tem vindo a causar vários problemas em suínos, quer ao nível respiratório, quer nas articulações.
O agente HPS é o responsável pela Doença de Glässer (DG), caracterizada por uma inflamação generalizada da pleura, pericárdio, peritoneu, membranas sinoviais e meninges, acompanhada pela elevada presença de fibrina.
HPS é normalmente um agente secundário causado por algum factor predisponente, como stress, pneumonias ou por algum vírus, em particular o Vírus do Síndrome Respiratório e Reprodutor Porcino (PRRSv).No caso das pneumonias verificou-se que o agente HPS é um invasor secundário oportunista e que causa doença em associação com outros agentes víricos ou bacterianos e está associado com maior prevalência de pneumonia por agentes respiratórios víricos, como o Síndrome Respiratório e Reprodutor Porcino (PRRS).
Durante este estudo de caso acompanhou-se um lote de leitões desde o desmame até ao final da recria, em que foram feitas serologias e enviados leitões inteiros para laboratório de forma a isolar e identificar o agente. Foi feita a avaliação da morbilidade bem como o cálculo do índice de tosse e taxa de mortalidade nas primeiras quatro semanas de recria. Efectuaram-se necropsias dos leitões deste lote.
Pretende-se, como objectivo deste estudo, definir o agente primário causador da patologia, neste caso o PRRSv, bem como a entrada da infecção bacteriana secundária causada pelo HPS.
Procedeu-se à vacinação do efectivo frente ao PRRSv.
Como profilaxia, devido à falha de protecção de imunidade maternal, fez-se a administração de tulatromicina a todos os leitões até todo o efectivo estar devidamente protegido frente ao PRRSv, conferindo assim uma boa imunidade maternal.
The porcine polyserositis complex is caused by multiple factors, particularly by Haemophilus parasuis (HPS), which has been causing several problems in pigs, both at the respiratory and articular levels. HPS is the causative agent of Glässer's Disease (DG), characterized by a generalized inflammation of the pleura, pericardium, peritoneum, synovial membranes and meninges, toguether with an abundant presence of fibrin. HPS is usually a secondary agent enhanced by some predisposing factor, like stress, pneumonia or some viruses, such as Porcine Reproductive and Respiratory Syndrome virus (PRRSv). In pneumonia, it has been show that HPS is an opportunistic secondary invader causing disease in association with other viral or bacterial agents being PRRSv the most prevalent respiratory viral agent found together with HPS. During this study a batch of piglets was followed from weaning until the end of nursery season, when serologies were performed, samples were collected and whole piglets were sent to pathology in order to isolate and identify the agent. Health condition was evaluated as well as the calculation of cough index and mortality rate in the first four weeks of nursery. Necropsies of the piglets of this batch were also carried out.The objective of this study was to define the primary agent causing disease (in this case PRRSv), as well as the factors that predisposed to secondary bacterial infections caused by HPS. Following these findings all herd was vaccinated against PRRSv. Due to lack of protective maternal immunity, tulathromycin was administered in pigs, as prophylactic measure until all sows were adequately protected against PRRSv, thus conferring good maternal immunity to their offspring.
The porcine polyserositis complex is caused by multiple factors, particularly by Haemophilus parasuis (HPS), which has been causing several problems in pigs, both at the respiratory and articular levels. HPS is the causative agent of Glässer's Disease (DG), characterized by a generalized inflammation of the pleura, pericardium, peritoneum, synovial membranes and meninges, toguether with an abundant presence of fibrin. HPS is usually a secondary agent enhanced by some predisposing factor, like stress, pneumonia or some viruses, such as Porcine Reproductive and Respiratory Syndrome virus (PRRSv). In pneumonia, it has been show that HPS is an opportunistic secondary invader causing disease in association with other viral or bacterial agents being PRRSv the most prevalent respiratory viral agent found together with HPS. During this study a batch of piglets was followed from weaning until the end of nursery season, when serologies were performed, samples were collected and whole piglets were sent to pathology in order to isolate and identify the agent. Health condition was evaluated as well as the calculation of cough index and mortality rate in the first four weeks of nursery. Necropsies of the piglets of this batch were also carried out.The objective of this study was to define the primary agent causing disease (in this case PRRSv), as well as the factors that predisposed to secondary bacterial infections caused by HPS. Following these findings all herd was vaccinated against PRRSv. Due to lack of protective maternal immunity, tulathromycin was administered in pigs, as prophylactic measure until all sows were adequately protected against PRRSv, thus conferring good maternal immunity to their offspring.
Description
Keywords
Poliserosite Haemophilus parasuis Pneumonia PRRS Suínos Doença de Glässer Polyserositis Swine Glässer Disease.