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在印度,一九六六年霍乱弧菌EL—Tor生物型取代了古典生物型。而在孟加拉国,一九六三年EL—Tor生物型首次在吉大港出现。一九六四年在达卡出现。以后消失了。但一九六八年又重新出
In India, the 1966 Vibrio cholerae EL-Tor biotype replaced classical biology. In Bangladesh, the 1963 EL-Tor biotype first appeared in Chittagong. Appeared in Dhaka in 1964 After disappeared. But again in 1968