Nine new species of tailed Bacillus phages, based on morphological and physicochemical properties, are defined. Phage P10 is one of the largest viruses known. The total number of tailed Bacillus phage species is presently 33.
Preparations of silkworm larvae contained two large phages with contractile tails (Myoviridae). One phage was active on Pseudomonas paucimobilis. The other, not cultivated, was one of the largest viruses known.
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