Selection of bacteriophage-resistant mutants of Streptococcus thermophilus.

Abstract excerpt

Phage-resistant mutants have been isolated from Streptococcus thermophilus. Selection was carried out using anti-phage antibodies or Hoechst 33258-labelled phages. Two mutants out of eight tested displayed reduced acidifying capacity. Selection of the bacteria that extruded more rapidly the fluorochrome 5-6-carboxyfluorescein diacetate (CFDA) restored the acidifying capacity of these two mutants to the level of...

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