During a cholera outbreak investigation, the minimum attack rate in a specific population subset exceeds 0.5% in a week. Under WHO criteria, this level of transmission in a previously unaffected area would be classified as:

• A Epidemic cholera ✓
• B Endemic cholera
• C Pandemic cholera
• D Hyperendemic cholera

Explanation

An epidemic is defined as a sudden increase in cases beyond what is normally expected in a defined population during a specific period. When cholera cases occur in a previously unaffected area with rapid person-to-person spread and attack rates exceeding expected levels, it constitutes an epidemic. Endemic cholera implies continuous low-level transmission in a geographic area; pandemic refers to worldwide epidemic affecting multiple countries.

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

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