One thousand men who were working in factory A were screened for HIV on 1 January 2002 and 50 of them were found to be p

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answerhappygod
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One thousand men who were working in factory A were screened for HIV on 1 January 2002 and 50 of them were found to be p

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One thousand men who were working in factory A were screened forHIV on 1 January 2002 and 50 of them were found to be positive forHIV antibodies. The screening was repeated in the same 1000 men on1 January 2003 and this time 62 men were positive, including the 50men who were positive on the first screening (no one had died orwas lost to follow-up).
a. What is the prevalence of HIV in men working in factory A on1 January 2002, and on 1 January 2003?
b. What is the annual risk of developing HIV infection in menworking in factory A in 2002?
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