Epidemiology of HIV/AIDS in the United States

HIV InSite Knowledge Base Chapter
Published March 2003
Dennis H. Osmond, PhD, University of California San Francisco
http://hivinsite.ucsf.edu/InSite?page=kb-01-03

Table 2. Distributions of U.S. AIDS Cases* by Transmission Exposure Group over Time


 Percent in Exposure Group
Transmission Exposure Group

1983

1992

2001

MSM

71%

52%

40%

IDU

17%

25%

26%

MSM IDU

NA

5%

4%

Heterosexual contact #

5%

9%

28%

Blood/blood product recipient

2%

1%

0%

No risk identified/other

6%

6%

2%

Key
IDU:  Injecting drug user
MSM:  Men who have sex with men
NA:  Not available
*  Adult incident cases in 2001 adjusted for reporting delays and redistribution of cases initially reported with no risk identified (31% of reports in 2001).
#  Includes "Born out of United States," formerly a separate group in 1983 (4%).