In order to know the prevalence of S. hyicus subsp hyicus in pigs, attempts were made to isolate the organism from 549 healthy adult pigs, 277 healthy suckling piglets and 17 piglets with exudative epidermitis from April 1988 to January 1989 in Chinju, Korea. Also determined was antibiotic susceptibility of the isolates.
Isolation rates of S. hyicus subsp. hyicus from adult pigs and suekling piglets were 27.0% and 53.1%, respectively. The organism was isolated predominantly from abdomen (10.9%) of adult pigs and external ear (31.6%) of suckling piglets. Isolation rates of the organism from piglets of different age group were in order of prevalence of 1(82.1%), 3(74.0%), 2 (54.7%), 4(52.9%), 5(15.2%) and 6(5.7%) post-natal weeks.
All of 489 isolates were sensitive to gentamicin, kanamycin and cephalexin but 23.7∼9.6% of the strains were resistant to erythromycin, penicillin G and tetracycline. The 49.2% of these resistant strains eshibited multiple drug resistance. The drug resistant patterns most frequently encountered were PG TC EM(10.7%) in triple pattern, PG TC(23.0%) in double pattern and TC(44.4%) in single pattern.
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