Columbia subject headings:
HIV (Viruses)--Risk factors--United States.
HIV (Viruses)--Transmission--United States.
HIV (Viruses)--United States--Transmission.
HIV infections--United States--Risk factors.
Medical personnel--Health risk assessment--United States.
Harvard subject headings:
HIV (Viruses)--Transmission--United States.
Medical personnel--Health risk assessment--United States.
Princeton subject headings:
HIV (Viruses)--Transmission--United States.
HIV infections--Risk factors--United States.
Medical personnel--Health risk assessment--United States.