Abstract
From August through December in 1988, edema disease sporadically broke out in piglets 30-43 days of age raised on three pig farms within the juris diction of Ehime's Chuo Livestock Hygiene Service Center, and pathological and bacteriological examinations were carried out.A bacteriological examination was carried in 7 dead animals which had been diagnosed as edema disease from the clinical signs and pathological findings and in one slaughtered case according to the results of a diagnostic test, and Escherichia coli was isolated from the small intestines at the ratio of 107-10 cfu/g. Serotype of the isolates turned out to be 0139 and these bacteria were found to produce Vero toxin. Furthermore, this toxin was identified as VT2vp by a DNA hybridization test using beads-ELISA and an oligonucleotide probe.From these findings, VT2vp-toxigenic Escherichia coli was considered to be a causative organism of swine edema disease. In addition, since some pigs having VT2vp-toxigenic Escherichia coli were confirmed, it was suggested that these carriers could possibly be an infection source. The present study is the first to isolate VT2vp-toxigenic Escherichia coli from pigs with edema disease or healthy pigs in Japan.
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