Strains of hemolytic
Vibrio cholerae O1 (E1 Tor vibrio) which are sensitive to Mukerjee's cholera phage group IV were isolated from cholera patients in North-East Thailand in 1986. Plaques of the phage on these hemolytic
V. cholerae O1 were usually translucent but almost transparent on some strains, just like the plaques on non-hemolytic
V. cholerae O1 (classical vibrio). These hemolytic
V. cholerae O1 were lysogenized with the infection of cholera phage IV, and the lysogenized strains produced phage different from cholera phage IV. These hemolytic strains were classified into Cured type in prophage typing of
V. cholerae O1, E1 Tor, because they were also lysogenized with Kappa phage and were hemolytic. When Cured-type
V. cholerae O1, E1 Tor previously isolated in various countries were examined for the sensitivity to cholera phage IV, some of the isolates were sensitive.
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