Comparison of different agars used in the formulation of buffered charcoal yeast extract medium

Author:

Edelstein P H1,Edelstein M A1

Affiliation:

1. Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104-4283.

Abstract

The effect of agar type used for buffered charcoal yeast extract medium supplemented with 0.1% alpha-ketoglutarate was tested based on the growth and size of Legionella pneumophila. Oxoid Agar no. 1, Difco Bacto and Bitek agars, and BBL Granulated, Grade A, and Select agars were tested. For colony size the agars were ranked in the following order: Oxoid agar no. 1 much greater than Bacto greater than Bitek approximately Granulated approximately Grade A greater than Select. Colony yield per plate was similar for all agars except for Grade A, which gave significantly fewer colonies after 3 days, but not 4 days, of incubation. Agar type significantly influences L. pneumophila growth on buffered charcoal yeast extract medium supplemented with 0.1% alpha-ketoglutarate.

Publisher

American Society for Microbiology

Subject

Microbiology (medical)

Reference9 articles.

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2. Bridson E. Y. and A. Brecker. 1970. Design and formulation of microbial culture media p. 257-266. In J. R. Norris and D. W. Robbins (ed.) Methods in microbiology vol. 3A. Academic Press Inc. New York.

3. Difco Laboratories. 1984. Difco manual 10th ed. Difco Laboratories Detroit Mich.

4. Improved semiselective medium for isolation of Legionella pneumophila from contaminated clinical and environmental specimens;Edelstein P. H.;J. Clin. Microbiol.,1981

5. Edelstein P. H. 1985. Legionnaires' disease laboratory manual. National Technical Information Service Springfield Va.

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