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Herd immunity measles — DTM&H MCQ

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ModerateEpidemiology and public healthHerd immunity measlesDTM&H

A measles outbreak occurs in a district where two-dose vaccine coverage is 72%. The health team considers why outbreaks continue. What is the most important public health measure?

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Correct answer: B — Coverage is below the high threshold needed for measles control

Coverage is below the high threshold needed for measles control is the single best answer because measles has very high transmissibility and needs very high vaccination coverage for population protection. Measles vaccine has no effect is plausible in a related presentation, but it is less appropriate because it does not fit the key discriminator in this vignette. The teaching point is that outbreak response should include vaccination of susceptible groups and surveillance.

Reference: WHO outbreak investigation guidance; Sphere Handbook; Manson's Tropical Diseases