Q:

In a bulk of hundred children out of whom 28 are immunized 2 of them get measles simultaneously. Subsequently14 get measles. Assuming the efficacy of the vaccine to be 100%, what is the secondary attack rate?

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In a bulk of hundred children out of whom 28 are immunized 2 of them get measles simultaneously. Subsequently14 get measles. Assuming the efficacy of the vaccine to be 100%, what is the secondary attack rate?


  1. 5%
  2. 10%
  3. 20%
  4. 21.5%
  5. 19.4%

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c) 20%

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