Prevalência da enteropatia proliferativa suína causada por Lawsonia intracellularis em suínos abatidos no Estado de Mato Grosso
Alberton, Evandro LuizCruz, Raquel Aparecida Sales daCaldeira, Flávio Henrique BravimPescador, Caroline ArgentaSouza, Marcos de AlmeidaColodel, Edson Moleta
Porcine proliferative enteropathy (PPE) is an infectious enteric disease that often affects pigs during the growing and finishing stages. Its etiological agent is the obligate intracellular bacterium Lawsonia intracellularis. This study evaluates PPE frequency and geographic distribution in Mato Grosso state, Brazil, based on PPE diagnosis and epidemiology data from pig herds. Materials, Methods & Results: An amount of 735 small intestine samples were collected from the ileum of finishing pigs and culling sows in three slaughterhouses that received animals from 14 breeding farms adopting very similar husbandry systems located in 11 municipalities in Mato Grosso state, Brazil, between August 2006 and July 2007. All samples were processed in the Laboratory of Veterinary Pathology, Federal University of Mato Grosso, according to standard laboratory routines for histological analyses. These samples were stained using the hematoxilin-eosin (HE) procedures. Those sections that presented at least one of the characteristic histopathological lesions of EPS were evaluated by HE, Alcian blue and Warthin-Starry combined stain (CST) to detect Lawsonia intracellularis-like structures, inside enterocytes and also by immunohistochemistry (IHC) based on a polyclonal antibody. Upon initial histological examination, 124 samples (16.87%) presented histopathological lesions that met the L. intracellularis infection criteria. These 124 samples were analyzed using the CST and IHC protocols, which revealed 2 and 3 positive results, respectively. PPE prevalence in Mato Grosso state was 0.41% in slaughtered pigs, based on the original number of 735 samples analyzed. [...](AU)
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