This paper deals with the distribution of Yersinia spp. isolated from the feces or the cecal contents of 1,755 pigs, 558 cows, 428 pigs slaughtered, 271 dogs slaughtered and 71 deer during the period of March 1985 to February 1986. Isolated yersinia spp. were examined for serotype, biotype and antibiotic susceptibility of Y. enterocolitica.
The results were as follows ;
One hundred and fourty-three stains of Yersinia spp. were isolated from 141 (4.5%) out of 3,103 animals examined and their isolates were identified as Y. enterocolitica(138 :strains), Y. kristensenii (3 strains), Y. intermedia(1 strain) and Y pseudotuberculosis(1 strain).
Yersinia spp. were isolated from 122(7.0%) of 1,755 pigs in piggeries, 15(3.5%) of 428 pigs slaughtered and 4(1.5%) of 271 dogs slaughtered, but no Yersinia spp. were isolated from cows and deer.
The isolation rate of Yersinia spp. in pigs ranged from 5.9∼8.0% in piggeries, it was higher in summer and autumn and highest in fattening pigs groups(10.4%), especially.
One hundred and thirty-eight Y. enterocolitica isolates belonged to serotype 0 : 3(95 strains), 0 : 8(13 strains), 0 5(7 strains), 0 : 9(6 strains), 0 1,2(1 strain) and untypable(16 strains), among them strains of serotype 0 3 biotype 3B(91 strains) were predominant.
Antibiotic susceptibility test of 138 isolates of yersinia spp. was performed by the agar dilation method, using S antibiotics as follows: ampicillin(Am), chloramphenicol, kanamycin, nilidixic acid(Na), rifampicin(Rf), streptomycin, sulfadimethoxine(Su) and tetracycline. All the strains tested were susceptible to Rf and Na, but resistant to Su, and 136 strains(98.6%) were also resistant to Am.
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