6. Cholera: Causal agent
While over 100 vibrio species have been isolated, only the “cholerae” species are responsible for cholera epidemics.
Vibrio cholerae species are divided into 2 serogroups: 1. V. cholerae O1, subdivided into Classical and El Tor biotypes, (Is the causal agent for 7th pandemic) 2. V. cholerae O139 sero– group, was first identified in 1992 in India