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J Bacteriol. 1979 May; 138(2): 618-624

Lysogenic pneumococci and their bacteriophages.

ABSTRACT

About half of pneumococci recovered from pediatric patients and one-third of isolates from adult patients yielded bacteriophages active against one or more of four noncapsulated indicator strains of pneumococcus. Strains of capsular types most frequently causing pediatric infections were associated with lysogeny. Classical restriction-modification phenomena have been demonstrated in vivo with some of the temperate phages, and correlation of restriction with the presence of one or the other of the two known pneumococcal restriction endonucleases has been established. The temperate phages differ serologically and in several other characteristics from virulent pneumococcal phages previously described. All pneumococcal phages so far studied can be classified into a minimum of three serological groups.

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