Abstract
141 strains of Shigella flexneri were isolated in Gunma Prefecture and divided into three main phage-types (A, B and C). Five bacteriophage were isolated from natural sources such as filtrates of sewage, dung water and animal feces (duck, fowl, ostrick, dog, fox, bear), and were used for typing. However the standard strain of Shigella flexneri 2a (Ew-10) did not belong to any of the above-mentioned three phage-types.The strains that were isolated from the cases of family infection and the ones isolated from the same epidemy were found to have the same phage-type.The variant with antigenic variation from 2b to 2a was obtained by cultivating 2b strains in the broth added with the anti-7 (8, 9) factor serum or with the phage 37 or 40.This variant of 2b → 2a belongs to the C-type. This variant and all 2a strains that belong to the C-type have not group 4 antigen, and fermente sucrose after 26 days cultivation at 37°C.In this paper it was demonstrated that there are 2a variants from Shigella flexneri 2b among the members of Shigella flexneri 2a that belong to the C-type.
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