Objective: To evaluate the incidence of HIV infection among men in the
Army Reserve Components (RC) in the United States. Methods: A prospec
tive follow-up evaluating HIV seroconversions among men in the RC. Men
who were initially seronegative were followed over time and periodica
lly retested. The duration of follow-up was measured for each individu
al. Date of seroconversion was estimated to be the mid-point between l
ast negative and first positive test. Demographic characteristics were
evaluated for association with seroconversion, and incidence density
between 1985 and 1991 was examined. Results: We followed 733 622 RC me
n for 1988 622 person-years between 1985 and 1991, and identified 534
seroconversions. Demographic correlates of risk included racial/ethnic
minorities, age between 20 and 34 years, never having married, reside
nce in an area with a low median income, and residence in metropolitan
areas with high incidence of AIDS. Among most of these groups, the in
cidence density did not change substantially or significantly from the
period 1985-1987 to 1991. Conclusions: The patterns of HIV infection
are generally similar to those for reported AIDS cases. The incidence
density over time is consistent with projections that AIDS incidence w
ill plateau in the United States in the mid- to late-1990s.