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In a particular community, 115 persons in a population of 4,399 became ill with a disease of unknown etiology. The 115 cases occurred in 77 households. The total number of persons living in these 77 households was 424. a) Calculate the overall attack rate in the community. b) Calculate the secondary attack rate in the affected households, assuming that only one case per household was a primary (community-acquired) case.
Sagot :
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