A Study of the Occupational Exposure to HIV Among Health

Multiple Choice

A study of the occupational exposure to HIV among health care workers recruited 33 health care workers who had become HIV-seropositive after exposure to HIV at work and 665 health care workers who had been exposed to HIV but had not become seropositive. The study found that contaminated health care workers were more likely to have been exposed to large amounts of blood and less likely to have taken the drug AZT immediately after exposure.
Which type of study is this?

A) Retrospective, case-control observational study
B) Prospective, cohort observational study
C) Sample survey
D) Anecdotal evidence