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Appl Environ Microbiol. 1973 March; 25(3): 436-441
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Effect of Selected Lactic Acid Bacteria on Growth of Staphylococcus aureus and Production of Enterotoxin1

William C. Haines2 and L. G. Harmon

a Department of Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48823

ABSTRACT

Representative strains of 15 species of lactic acid bacteria were examined for their ability to influence growth of Staphylococcus aureus and production of enterotoxin in associative culture. Among the organisms used as effectors the streptococci were most inhibitory, followed by Pediococcus cerevisiae. The lactobacilli and Leuconostoc citrovorum were not inhibitory to growth and only slightly inhibitory to production of enterotoxin. Enterotoxin was detected in all cultures in which the population of S. aureus reached 8 x 107 per ml. At lower S. aureus populations no enterotoxin was detected after incubation for 48 h. Mechanisms of inhibition of growth and enterotoxin production by S. aureus strain 243 grown in association with Streptococcus lactis A64 or P. cerevisiae 10791 in APT broth were investigated. Competition for vital nutrients, especially niacin and biotin, and probably production of hydrogen peroxide contribute to inhibition. Production of lactic acid appears to inhibit growth of S. aureus in the early but not the late stages of incubation.

FOOTNOTES

2 Present address: L. D. Schreiber Cheese Co., Green Bay, Wis. 53706.

1 Michigan Agricultural Experiment Station Journal Article No. 6067.

Appl Environ Microbiol. 1973 March; 25(3): 436-441
Copyright © 1973 American Society for Microbiology. All Rights Reserved.





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Copyright © 1973 by the American Society for Microbiology. All rights reserved.