Eight phages lysogenic for var. which elicit the lytic response in var. were isolated by induction of the host strains. We have divided these phages into three groups: group I, phages GT-1 to GT-5; group II, GT-6 and GT-7; group III, GT-8. The following properties of the phages were examined: morphology, host range, serum neutralization, adsorption rates, one-step growth characteristics and thermal inactivation rates. The three groups are readily distinguishable on the basis of morphology and host range. Group II and III show a high degree of homology in regard to their host range, serum neutralization, one-step growth and thermal inactivation characteristics. The phages bear a certain resemblance to previously reported virulent phages of (Chapman & Norris, 1966; Colasito & Rogoff, 1969).


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