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Case of Hepatitis Outbreak

Case Scenario:

7 cases of hepatitis A occurred among 70 children attending a child day care center. Each infected child came from a different family. The total number of persons in the 7 affected families was 32. One incubation period later, 5 family member of the 7 infected children also developed hepatitis.


  1. Calculate the attack rate.
  2. Is this primary of secondary attack rate?


1. Secondary attack is used to measure the frequency of new cases of disease among contacts of known cases.

Secondary attack rate = Number of new cases/Population at risk x 100

= 5/(32-7) x 100 = 20%

2. It is secondary attack rate

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