Gastroenteritis of viral origin in pigs. Enteritis caused by adenovirus in piglets

Mocsari, E.

Allategeszsegugyi es Takarmanyozasi Kozlemenyek 1: 5-10


Accession: 001373747

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Porcine adenoviruses become established in the epithelial cells of the small intestines and multiply in the middle section of the intestinal tract. Infection accompanied by clinical symptoms occurs only in unweaned piglets. The incubation period is 3-4 days. The faeces are yellowish in colour and liquid. The diarrhoea, which lasts for 3-6 days, leads to dehydration and retarded development, but mortality is very low. In pigs more than two weeks old the adenovirus infection causes no illness. A prominent pathological change is thinning of the intestinal wall, while villi of the small intestine are shortened by up to 20%. In the large intestine there are no changes which can be observed by light microscopy. Diagnosis can be made only by laboratory methods, chiefly immunofluorescence and the immunoperoxidase method. Pigs which have been infected acquire active immunity, and sows pass passive protection on to the piglets through their milk. Adenovirus antibodies can be demonstrated in around 80% of mature animals. Control measures include improvement in environmental and hygienic conditions, and the treatment of bacterial secondary infections with antibiotics.