PHAGE SUSCEPTIBILITY OF VIBRIOS ISOLATED IN THAILAND

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Abstract
Vibrio comma, El Tor and NAG vibrios isolated in cholera epidemics in Thailand in 1959 and 1960 were tested for their sensitivity patterns to the 4 groups of typing cholera phages. All the 63 V. comma strains belonged to the universally lysable phage type 1, which provided further confirmation of the uniformity of phage type strains in a geographically localized epidemic. Ten per cent of the vibrio strains, agglutinable by cholera O serum, were El Tor vibrios. As compared to this, in 6 years of studies of cholera cases in Calcutta epidemics, only 2 El Tor vibrios were isolated for 1733 strains of V. comma. For this high frequency in incidence of El Tor vibrios it is suggested that the outbreaks in Thailand might be due to mixed cholera and paracholera infections caused by V. comma and El Tor vibrios respectively.

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