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  • Title: Correlation between occurrence of exudative epidermitis and exfoliative toxin-producing ability of Staphylococcus hyicus.
    Author: Tanabe T, Sato H, Sato H, Watanabe K, Hirano M, Hirose K, Kurokawa S, Nakano K, Saito H, Maehara N.
    Journal: Vet Microbiol; 1996 Jan; 48(1-2):9-17. PubMed ID: 8701581.
    Abstract:
    Staphylococcus hyicus was isolated from healthy pigs and pigs affected with exudative epidermitis (EE). Thirty seven strains (P-7 to P-43) were isolated from pigs affected with EE on 8 farms while 131 strains were isolated from healthy pigs bred on 2 farms in Japan. Isolation rate for pigs affected with EE was 100% while that for healthy pigs was 35.4%. The biochemical and cultural characteristics of the isolates from healthy and diseased pigs were identical except for the Voges-Proskauer reaction. The culture supernatant of many isolates caused skin exfoliation in 1-day-old chickens. Therefore, many isolates were considered to produce S. hyicus exfoliative toxin (shET). The rate of shET production by the isolates from piglets affected with EE was 87.5%, while that of the isolates from healthy pigs was 76.1%. shETs were divided in two serotypes by immunodiffusion. Piglets experimentally infected with shET-producing and nonproducing strains were observed. Local skin erythema at the inoculation site was observed with nonproducing strains and disappeared within 48 h, while the skin erythema at the sites inoculated with shET-producing strains did not disappear until 7 days after inoculation. Typical clinical signs, such as exfoliation, exudation and crusting were observed only in the piglets inoculated with shET-producing strains.
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