Abstract
Ten lactic streptococcal temperate phages and eight lactic streptococcal virulent phages classified on the basis of host range were differentiated by DNA-DNA hybridization. Virulent phages were classified in two distinct homology groups and temperate phages in a single one. In both temperate and virulent phages, no correlation was found between DNA homology groups and lytic groups. For most of the virulent phages, no DNA-DNA hybridization occurred with the temperature phages; however, partial sequence homology was found with DNAs from two virulent phages and four temperate phages.
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