Studies on Exudative Epidermitis in Pigs : I. Isolation and Some Properties of Staphylococcus hyicus subsp. hyicus from Diseased and Healthy Pigs

돼지 삼출성(渗出性) 표피염(表皮炎)에 관한 연구(硏究) : I. 발증돈(發症豚) 및 건강돈(健康豚)으로부터 Staphylococcus hyicus subsp. hyicus의 분리(分離) 및 그 성장(性狀)

Isolation of Staphylococcus hyicus subsp. hyicus from piglets suffering from exudative epidermitis and healthy pigs was performed, and some properties of the isolates were examined. Twentry-six litters of exudative epidermitis observed in the field were sucking piglets with ages ranging from 1 to 5 weeks and most (73.1%) of these cases occurred in piglets between 2 and 3 weeks of age. Staphylococcus hyicus subsp. hyicus was isolated front 192(38.9%) of 494 healthy pigs. The rate of isolation of these organism from healthy pigs was found to vary greatly among farms at an isolation rate of 33.3% to 45.5% and this organism was isolated more frequently front sucking piglets below the age of 8 weeks than adult pigs. All of the isolates originated from the diseased and healthy pigs were positive in heat-stable DNase, Tween 80 hydrolysis, gelatinase, protease, but negative in clumping factor and hemelysin on sheep blood agar. There was no difference related to origin in the production of extracellular active substances. Typical lesions of the classic exudative epidermitis were produced by inoculation of Staphylococcus hyicus subsp. hyicus isolated from the diseased and healthy pigs. The pathogenic potentials of isolates from healthy pigs were no different from that of the isolates obtained from diseased pigs.