Abstract
Of 664 Salmonella cultures isolated during 1962 from a variety of sources in Canada, 56 (8.4%) were resistant to one or more of the antibiotics tetracycline, chloramphenicol, and ampicillin. Of the 38 serotypes studied, S. typhimurium and S. heidelberg showed a much higher proportion of strains resistant to tetracycline than did the other serotypes. The incidence of resistant strains among 335 cultures from man was 6.9%; among 74 strains from poultry, 35.1%; while among 52 strains from other animal sources only 5.8% were resistant.
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