Further study of the phages isolated from lysogenic strains of confirms that they are of at least two classes: (1) phages active only on other strains and (2) phages initially active only on strains but sometimes adaptable to lyse strains. Ten phages of the first class, five adapted phages of the first class and three adapted phages of the second class could all be propagated on strains of of biotype 1. They are all adsorbed by strains of and belong to a single serological group that is distinct from the groups A, B, F and L of phages.

A provisional set of 18 phages proposed for typing is described and characterised.


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