Abstract
The properties of coli-dysentery phages T3, T7, and D44 and of Serratia phages I and IV were described. It has been demonstrated that these phages are serologically related, morphologically similar, and have many physiological properties in common. On the basis of serological, morphological, and physiological criteria it is concluded that these phages should be classified as strains or types within a single species. The properties of the T3, D44 species were compared with the properties of the T2, C16 and the T5, PB species.

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