6. Which of the following are the serogroups of causative agents of cholera? 1. Ogawa 2. 0139 3. Inaba 401

The correct answer is:1. Ogawa3. InabaExplanation: Cholera is caused by the bacterium Vibrio cholerae. There are several serogroups of Vibrio cholerae, and the most common ones include Ogawa, Inaba, and Nageoka. These serogroups are classified based on their specific antigens and are important for epidemiological purposes. The serogroup 0139 is not a recognized serogroup of Vibrio cholerae.