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Appl Environ Microbiol. 1973 June; 25(6): 905-907
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Gentamicin Blood Agar Used as a General-Purpose Selective Medium

^a Department of Microbiology, St. Joseph's Hospital, London, Ontario, Canada

ABSTRACT

The potential value of a blood agar medium containing a final concentration of 5.5 µg of gentamicin per ml was assessed in a diagnostic laboratory over an 8-week period. The medium gave increased isolation rates of beta-hemolytic streptococci, other streptococci, Bacteroides, clostridia, and yeasts. It also proved valuable in detecting gentamicin-resistant gram-negative bacilli when these were present in heavy mixed culture.

¹ Present address: Department of Microbiology, University Hospital, London N6G 2K3, Canada.