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Journal of Dairy Science Vol. 35 No. 8 668-674
© 1952 by American Dairy Science Association ®
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Multiple Strain Bacteriophage Infections of Commercial Lactic Starters1

Darrell D. Deane and F. E. Nelson

Iowa Agricultural Experiment Station, Ames

ABSTRACT

All but one of ten samples of whey or culture from four dairy plants experiencing "slowness" in their lactic cultures or products contained lactic streptococcus bacteriophage. The activity pattern of the bacteria-free whey filtate prepared from each of these nine samples indicated a multiple-strain bacteriophage infection.

On the basis of the test cultures lysed, ten different bacteriophage strains were isolated from a blue cheese whey and six (possibly seven) from a cottage cheese whey. Electron micrographs of the ten bacteriophage strains isolated from the blue cheese whey revealed that all were similar in morphology.

FOOTNOTES

1 Journal Paper no. J-2072 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project no. 1194.






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Copyright © 1952 by the American Dairy Science Association ®.