| Summary |
Ten unvaccinated pigs, aged 10 weeks, were infected with ALD virus by oral route. The huffy coat of blood and ear biopsies were prepared and compared for hog cholera diagnosis. The HC specific fluorescent appeared in the cytoplams of leucocytes once the fever response took place, but it appeared in the cells of the skin of ears 3 to 4 days later.
For observation of non-suppurative encephalitis, The brains were collected from the four groups of pigs. Group one was consisted of 11 pigs that were precolostrally immunized and sacrificed at 10 weeks of age. 24 pigs in group two were immunized at 3, 6 weeks of age and sacrificed at 10 weeks old, too. For the group three, 37 pigs were immunized at 3, 6 weeks of age and challenged at 10 weeks of age and sacrificed at 42 days post challenge, and group four, 19 pigs came from the slaughter house were sacrificed for markets. Since the results showed that there were different percentage and mild to severe non-suppurative encephalitis in each group of pigs, it should be take care to make a diagnosis for hog cholera for the pathologists. The lesions of vasicular cuffing were seen in 6 pigs (54.5 %) of gruop one, 13 (54.1 %) of group two, 23 (62.1 %) of group three and 13 (68.4 %) of group four. And the lesions of gliosis were found in 4 pigs (36.3 %) of gruop one, 9 (37.5 %) of group two, 19 (50.8 %) of group three and 8 (42.1 %) of group four.
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