Method for producing mucoid and phage resistant group N streptococcus strains from non-mucoid and phage sensitive parent strains
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United States of America Patent
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Apr 17, 1990
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N/A
app pub date -
Oct 11, 1985
filing date -
Oct 11, 1985
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Expired
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Abstract
A method for imparting phage resistance to phage sensitive strands of Streptococcus group N is described. The method involves transferring plasmid encoding for production of a mucoid substance (Muc.sup.+) into the phage sensitive strain. Even if the Muc.sup.+ plasmid is removed by curing at elevated temperatures the strains remain resistant to phage. The resulting resistant strains are novel and are used for fermentations, particularly milk fermentations.
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