Transcript 2009_epiupdate_report_figure23_en

Estimated new HIV infections by transmission category, extended back calculation
model, 50 US states and the District of Columbia, 1977–2006
Infections
80 000
70 000
Men who have sex with men (MSM)
Injecting drug use (IDU)
60 000
MSM / IDU
Heterosexual
50 000
40 000
30 000
20 000
10 000
0
19771979
1980- 1982- 1984- 1986- 19881981 1983 1985 1987 1990
19911993
19941996
19971999
20002002
20032006
Period
Tick marks denote the beginning and end of a year. The model specified periods within which the number of HIV infections
was assumed to be approximately constant.
Source: Hall et al. (2008a).
2009 AIDS epidemic update Figure 23