Colony Incompatibility among New Zealand Isolates of Salmonella typhimurium

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Abstract
Strains of S. typhimurium representing various phage-types were permitted to swarm towards each other on soft agar to determine their compatibility. Some strains, regardless of phage-type, were totally compatible, but others regularly formed incompatibility zones. The widths of these zones varied from less than 1 mm to 12 mm. A detailed study of 30 strains of phage-types 1 and 42 showed that they belonged to a variety of incompatibility groups, while 4 strains of phage-type 179, which was only recently found in New Zealand, all belonged to 1 incompatibility group.

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