Abstract:

Abstract: The swine serum samples were collected from various regions of Liaoning Province, and the investigation was carried out by the application of hemagglutination and hemagglutination inhibition test for detection of hemagglutinating encephalomyelitis virus (hemagglutinating encephalomyelitis virus, HEV) antibody. As a result, there were 451 samples with HEV positive antibodies in the total 910 samples detected, of which the positive rate reached 49.6%. Among a total of 280 samples selected from 10 large-scale swine farms, the HEV antibodies’ positive rate was as high as 70.0%, and in a sample of different age stages of pig serum samples, the highest HEV antibodies’ positive rate of sows took up 73.8%, 67.5% went to the piglets and the lowest 37.0% finishing swine. Investigating results proved that there existed the prevalence of HEV infection at the regions of Liaoning Province. In addition, adult swine, from which serum was collected, showed no clinical symptoms, which might indicate that the disease mainly expressed in implicit infections, and a small number of piglets showed clinical symptoms. Taken together, the diagnosis result was HEV mixed infection with SFV and /or such as PRRSV. Keywords: HEV; serological investigation ; swine