A rapid and simple scheme for confirmation of salmonella tester strain phenotype

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Abstract
A simple scheme has been developed for confirming the phenotype of the standard set of Salmonella typhimurium tester strains. This scheme employs a series of filter paper discs impregnated with diagnostic mutagens or bacterial toxins. Up to 6 diagnostic discs can be placed on a petri dish to test a single Salmonella strain. The Salmonellae are distinguished by their responses to ampicillin, crystal violet, nitrofurantoin, 9‐aminoacridine, 4‐nitro‐o‐phenylenediamine and sodium azide.