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. 1966 Mar;14(2):178–182. doi: 10.1128/am.14.2.178-182.1966

β-Galactosidase for Distinguishing between Citrobacter and Salmonella

M J Pickett 1, R E Goodman 1
PMCID: PMC546646  PMID: 5335384

Abstract

Detection of β-galactosidase with the aid of o-nitrophenyl-β-d-galactopyranoside (ONPG) was examined as a means for distinguishing between Citrobacter and Salmonella. Several factors which influence sensitivity and reliability of the test were studied. A bacteriostat, sodium azide, was included to permit prolonged incubation of weak and negative strains of enteric bacilli. By the procedure described, salmonellae gave negative ONPG tests; all of 171 strains of Citrobacter gave positive tests.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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