Colony incompatibility studies among New Zealand and Australian isolates of Salmonella typhimurium phage type 179.

Recent New Zealand and Australian isolates of Salmonella typhimurium phage type 179 were studied for relatedness by colony incompatibility. This established that all but one strain of the New Zealand groups probably formed a clone despite carrying a variety of plasmids. The Australian strains showed a far greater diversity. This study demonstrates the epidemiological usefulness of the colony incompatibility reactions.