The Correct Answer is B
Attack Rate
An attack rate is a variant of an incidence rate, applied to a narrowly defined population observed for a limited time, such as during an epidemic.
The attack rate is usually expressed as a percent.
Example
Of 75 persons who attended a picnic, 46 subsequently developed gastroenteritis.
Calculate the attack rate of gastroenteritis
Attendees = 76
ILL = 46
Attack rate = (46 ÷ 76) X 100
= 61%
Secondary Attack Rate
A secondary attack rate is a measure of the frequency of new cases of a disease among the contacts of known cases.
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