Abstract
Two strains of Vibrio parahaemolyticus were isolated from cases of food poisoning which occurred in Osaka prefecture in 1974. Analysis of O-antigens was carried out on them. It was demonstrated that these strains possessed O12 antigen, which had previously been reported by Miwatani et al. (Biken J., 12: 9-15, 1969). The K-antigen of these strains was found to be K19.