Plasmid Profiles of Salmonella typhimurium var. copenhagen Strains Isolated from Horses

Abstract

Twelve strains of Salmonella typhimurium var. copenhagen were isolated from diseased or dead 1 to 2-year-old Thoroughbred foals on 10 farms in the Hidaka district of Hokkaido, Japan, in 1983. They showed 5 resistance patterns against 7 antibiotics and were classified into biovars of 26e (11 strains) and 26eh (1 strains) in the scheme of Duguid et al. (1975). They revealed, however, a uniform plasmid profile (3.8, 5, or 58 Mdaltons in molecular weight) in agarose gel electrophoresis.