In a large cohort study, 500 high risk volunteers between the ages of 20 and 30

Question

In a large cohort study, 500 high risk volunteers between the ages of 20 and 30 years without a history of herpes simplex (HSV) infection were monitored over a 2-year period for the incidence of new HSV infection After two years of close observation, 50 subjects developed HSV infection. Which of the following statements is true? Incidence cannot be calculated because the study does not identify new HSV infections The incidence rate (or incidence density) was 10% The annual risk for HSV infection was 10% The annual risk for HSV infection was 5% (assuming that new infections occurred equally between the two years) The risk ratio was 2.0

Explanation / Answer

Here the incidence rate or incidence density is 10% because the details given here doe not identity the yearly frequency of HSV.

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