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Phage resistance in pure strains of cheese starter streptococci
Published online by Cambridge University Press: 01 June 2009
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.
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