Increased occurrence of KCN-resistant Salmonella strains.
104 KCN-resistant Salmonella strains were detected among 1391 strains typed (7.4%) during the first 7 months in 1993. In particular Salmonella enterica strains of subspecies I isolated from humans and foods exhibited this character. Those KCN-resistant Salmonella strains did not belong to a special antigen formula. The second flagellar phase could not be detected in most of these strains. KCN resistance does not seem to be plasmid-encoded.