Regarding cholera surveillance in India, what is the minimum bacteriological criterion for confirming a cholera outbreak at a district level?

• A Clinical diagnosis alone in at least 10 patients with rice-water stools
• B Positive rapid antigen test in 5 or more patients
• C Positive serology (vibriocidal antibody) in the index case
• D Isolation of Vibrio cholerae O1 or O139 from at least one stool specimen ✓

Explanation

WHO and IDSP guidelines require laboratory confirmation of at least one culture-positive case (Vibrio cholerae O1 or O139) to declare a cholera outbreak, after which subsequent cases may be classified clinically. The O1 serogroup (El Tor biotype) and O139 (Bengal strain) are the causative agents of epidemic cholera. Rapid diagnostic tests support surveillance but are not a substitute for the confirmatory standard of culture.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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