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To find healthy Salmonella carriers among swine, isolation of Salmonella from fresh cecum samples was attempted at slaughterhouses in Tokyo, Saitama, and Tochigi during a period of 11 years. Of a total 3,058 samples, 1,341 were collected between 1975 and 1979, and the other 1,717 between 1984 and 1989. The overall isolation rate of Salmonella was 13.3% (408 pigs). The rate was 23.1% between 1975 and 1979 and 5.7% between 1984 and 1989. A total of 1,037 isolates were identified as Salmonella and classified into 28 serotypes. These serotypes involved Salmonella typhimurium (26.1%), S. derby (25.4%), and S. london (9.5%). However, the detection rate of these serotypes varied from year to year. Two serotypes were detected from each of 37 pigs and three from a pig. Of these 38 pigs, 27 carried the serotypes of S. typhimurium or S. derby or both. The present study revealed that Salmonella carriers were highly frequent among healthy swine in Japan in 1970s, but decreased in 1980s.

Incidence and Serotypes of Salmonella in Apparently Healthy Swine at Slaughterhouses in Japan Between 1975 and 1989.