<prompt> The following are true of vibro cholerae exceptProduces indole and reduces nitratesSynthesises neuraminidaseDies rapidly at low temperatureAll  <response>: Ans. is c i.e., Dies rapidly at low temperature . Duration of protection of cholera vaccine is 3-6 months. . Vibrio cholerae does not die at lower temperature, infact it grows at lower temperature range 16-40degC 