One incubation period later, 17 persons in the same households as these “primary” cases developed shigellosis. If the population of the community was 1,000, then the overall attack rate was 18 ⁄ 1,000 × 100% = 1.8%. A variety of attack rates can be calculated.ĮXAMPLE: Calculating Secondary Attack RatesĬonsider an outbreak of shigellosis in which 18 persons in 18 different households all became ill. It is the risk of getting the disease during a specified period, such as the duration of an outbreak.
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