Question: Consider the following data on HIV seroconversion (from negative to positive) in a high- risk group of 650 subjects. Assume that HIV positivity is permanent, and there are no entries to or losses from the group of subjects. The study begins on January 1 2001 and as of this date, there are 18 participants who are found to be positive, on January 1 2002 there are 2 positives, and on January 1 2003 there are 5 positives. Calculate:

1. The population at risk for HIV seroconversion on January 1 2001.
2. The prevalence on January 15 2002.
3. The cumulative incidence over this study period.

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