SUMMARY: Bacteriophage CG33 was isolated from a strain of that had become contaminated during an industrial fermentation. CG 33 was assigned to Bradley's group B since it had a polyhedral head 40 nm wide and a short non-contractile and striated tail 78 nm long. Adsorption to its host, ATCC 13287, was enhanced in the presence of Ca. The latent period was 18 min at 34°C; the burst size was 16 p.f.u. ml. CG33 also formed plaques on ATCC 15990 but at a low frequency. Its genome consisted of a linear double stranded DNA molecule of 13.4 kb with cohesive ends. A restriction map of the genome was obtained by using various endonucleases.


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