Solve mcq
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The answer is c) Given around a mile of a case detected.
Ring vaccination is a surveillance and containment strategy that involves:
- Identifying a case of a disease (classically smallpox; also used for Ebola)
- Vaccinating all contacts within a defined geographic radius ("ring") around that case — as well as their contacts
The textbooks confirm this: Goldman-Cecil Medicine describes it as "active case finding with vaccination of potential contacts within a certain radius around the cases." The Dermatology text similarly states it involves "isolation of patients with suspected infection and immunization of all identified contacts as well as their contacts."
Why the other options are wrong:
- a) — There is no "ring shape machine"; this is a meaningless distractor.
- b) — Ring vaccination does not refer to producing a ring-shaped lesion (though the smallpox vaccine does leave a characteristic scar, that's unrelated to the strategy's name).
- d) — The strategy is defined by a geographic/contact radius around a case, not a fixed 200-yard distance.
The "ring" in ring vaccination refers to the epidemiological ring (circle of contacts) drawn around a detected case, not a specific distance like 200 yards.
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