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. 1966 Jul;92(1):148–154. doi: 10.1128/jb.92.1.148-154.1966

Characteristics of Group A Streptococcal Bacteriophages1

Patric L Friend a,2, Hutton D Slade a,3
PMCID: PMC276209  PMID: 5941274

Abstract

Friend, Patric L. (Northwestern University Medical School, Chicago, Ill.), and Hutton D. Slade. Characteristics of group A streptococcal bacteriophages. J. Bacteriol. 92:148–154. 1966.—A medium for the growth of group A streptococcal phages is described, consisting of Brain Heart Infusion broth supplemented with 0.2% yeast extract, 10−4m CaCl2, and 10 μg/ml of dl-tryptophan. Cell and phage growth in this medium was excellent, and did not require the addition of serum or other proteins as indicated by other workers. Growth of one phage has also been achieved in a completely synthetic medium. The adsorption characteristics of two group A phages in protein broth and synthetic broth were studied, and the initial adsorption of phage was found to be more extensive in synthetic broth. However, the final amounts of adsorption in both were similar. The addition of purified group A carbohydrate antigen to the adsorption mixture in synthetic broth had no effect on the adsorption, and cells containing type-specific M protein adsorbed phage at the same rate as those lacking M protein. It was concluded that neither the group antigen nor the type antigen was the primary site of phage adsorption. One-step growth curves of the two phages showed a second step or burst occurring. Sonic oscillation of the bacterial cultures, which broke up the chains to single cells, abolished the second step of the growth curve. It appears that the second step is a function of the chain formation of streptococcal cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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