Summary: A broad range of typing phages belonging to lytic groups I, II, III, IV and those classified as miscellaneous produced plaques on strain 1. Two variant forms of this strain were compared, and Phages belonging to lytic group II, of both A and B serology, had low efficiencies of plating (EOP) for the variant but had high EOP values for the variant. In general, of phages from other lytic groups, those of B serology tended to plate with low EOP values on both variants, whereas those of A serology plated with high EOP values. Propagation of several of the phages on both 1 hosts resulted in host-modifications of the phage progeny. Similar host-induced modifications were produced by propagation of the phages on 73. The host-modified phages showed striking losses in plating efficiency for their usual propagating hosts. The significance of these findings with respect to genetic classification of the phages and hosts is discussed.


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