From May to September, 1984, proliferative haemorrhagic enteropathy (PHE) broke out among hogs and young breeding pigs on three closed farms in Niigata prefecture.A young breeding pig and one hog died. They were submitted to pathological and bacteriological examination, as well as three disaeased hogs.Campylobacter hyointestinalis (CHI) was isolated from the ileal mucosa of the five pigs. Viable bacterial count per gram of affected mucosa ranged from 106.4 to 107.4. Strains of CHI isolated from three farms were serologically homogenous, and were sensitive to benzylpenicillin, aminobenzylpenicillin, tetracycline, oxytetracycline, colistin, furazolidon and carbadox.Inspection was made for the occurrence of PHE on other 24 farms in Niigata Prefecture. As a result, PHE was found in 40 pigs (0.22%) of 12 farms over a period from June, 1982 to September, 1984
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