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Phage resistance in pure strains of cheese starter streptococci

Published online by Cambridge University Press:  01 June 2009

P. S. Robertson
P. S. Robertson
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
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Summary

The ratio of phage-resistant to phage-susceptible chains in five strains of Streptococcus cremoris and two of Str. lactis was investigated. It was shown that this ratio varied between strains and was decreased when the cultures were subcultured with extremely small inocula ( <50 chains/ml) and increased with relatively large inocula (1%). It is suggested that resistant cells arise by mutations occurring in the absence of phage.

Type
Original Articles
Information
Journal of Dairy Research , Volume 27 , Issue 2 , June 1960 , pp. 161 - 164
Copyright
Copyright © Proprietors of Journal of Dairy Research 1960

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References

REFERENCES

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