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Journal of Dairy Science Vol. 69 No. 8 2031-2037
© 1986 by American Dairy Science Association ®
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Resistance of Streptococcus lactis Mutants to ß-Lactam Antibiotics

J. L. Parada1 and M. Pamies De Giacchi

Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina

ABSTRACT

Minimal inhibitory concentration and minimal bactericidal concentrations of penicillin and other ß-lactam antibiotics were determined for Streptococcus lactis in milk and trypteine soy broth. The values were always higher in milk than in broth. Minimal inhibitory concentration of penicillin was higher in solid than in liquid media. Two mutants resistant to penicillin and other ß-lactam antibiotics were obtained, and their growth rate, proteolysis, and acidification patterns determined. Tolerance toward these antibiotics was found when the mutants were grown in milk but not when they were grown in broth.

FOOTNOTES

1 CONICET.






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Copyright © 1986 by the American Dairy Science Association ®.