A 6-year study (lasting from January 1, 2012 to December 31, 2017) was conducted examining the risk of contracting HIV i

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A 6-year study (lasting from January 1, 2012 to December 31,
2017) was conducted examining the risk of contracting HIV in
intravenous (IV) drug users (who were not currently HIV positive at
the beginning of the study period). On the date the study began, 10
HIV-negative drug users were enrolled. Researchers made contact at
the end of every year (December 31st) to record relevant
information from the study participants. The following represents
the information the researchers collected from each of the 10
participants.
Calculate the incidence density of HIV in the study participants
during the 6-year study.
Group of answer choices
None of the answers listed here are correct.
6.4 cases per 100 person years
1.3 cases per 100 person years
2.1 cases per 100 person years