[Bacteriophages isolated from smallpox vaccine].

A number of lots of dermal and tissue culture smallpox vaccine was studied for the presence of bacteriophage. The presence of bacteriophage was established in lots of tissue culture vaccine but not in the dermal vaccine. Bacteriophage was detected by a modified method for phage isolation. The concentration and activity of the isolated bacteriophage were low. Its activity was increased by passages. The bacteriophage was stable and lysed the main serotypes of enteropathogenic E. coli as well as strains of Shigella sonnei and Salmonella of typhoid A.