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To calculate the rates, divide the number of persons who

become ill after they ate a particular food or meal by the total number of

persons (both cases and controls) who ate that food or meal, and multiply

the results by 100.

Number of new cases reported during an endemic period x multiplier

----------------------------------------------------------------------------------------------

Total population at the beginning of the endemic period

The multiplier is usually a large multiple of 100, often 1000, 100 000 or 1 000 000 depending on the population size.

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Q: How do you calculate the overall attack rate of disease in epidemiology?
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How do you calculate the secondary attack rate of disease in epidemiology?

Number of new cases among contacts of known cases x multiplier--------------------------------------------------------------------------------------Size of the the contact population at riskThe secondary attack rate is the probability that infection will occur among people at risk given a reasonable incubation period following proven contact with infection persons (AKA known cases) or infected sourcesThe multiplier is usually a multiple of 100, often 1000, 100 000 or 1 000 000 depending on the population size.


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