During a measles outbreak, a district health team visits every household in the affected village to identify new cases. This type of surveillance is best described as:
- A Active surveillance ✓
- B Passive surveillance
- C Sentinel surveillance
- D Syndromic surveillance
Correct answer: A. Active surveillance
Explanation
Active surveillance involves health authorities actively seeking cases through visits, surveys, or screening, rather than waiting for reports. It is resource-intensive but more complete than passive surveillance, where facilities report cases that present to them. Sentinel surveillance uses selected sites, and syndromic surveillance uses clinical syndromes before diagnosis.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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