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Appl Environ Microbiol. 1961 November; 9(6): 478-480

Lysine-Iron Agar in the Detection of Arizona Cultures

P. R. Edwards and Mary A. Fife

Communicable Disease Center, Department of Health, Education, and Welfare, U.S. Public Health Service, Atlanta, Georgia

ABSTRACT

A lysine-iron agar is described and recommended for the detection of Arizona strains which ferment lactose rapidly. Black colonies which appear on bismuth sulfite agar should be transferred to the medium. Salmonellae and Arizona cultures produce a distinctive reaction since they are the only recognized groups of enteric bacteria which regularly produce lysine decarboxylase rapidly and form large amounts of hydrogen sulfide. Use of the medium is particularly recommended in the examination of specimens from enteric infections in which shigellae and salmonellae are not detected.

Appl Environ Microbiol. 1961 November; 9(6): 478-480






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