Declining prevalence of HIV-1 infection in young Thai men.
OBJECTIVE
To evaluate trends in HIV-1 seroprevalence in Thailand.


METHODS
HIV-1 serosurvey of successive cohorts of young Thai men entering service with the Royal Thai Army (RTA) between November 1989 and November 1994.


METHODS
In November 1989, the RTA Medical Department began routine HIV-1-antibody screening of men who were selected by lottery for conscription. Between November 1989 and November 1994, 311,108 young men were screened at induction. Demographic data were collected between November 1991 and May 1993 and again in November 1994.


RESULTS
The seroprevalence of HIV-1 among conscripts nationwide increased rapidly from 0.5% in 1989 to 3.5% in 1992 and reached 3.7% in 1993. In 1994, the overall prevalence decreased to 3.0%. The decrease was greatest in the upper North (from 12.4% in 1992 to 7.9% in 1994), where the prevalence has been the highest. However, decreases were observed in men from all regions of residence in the country, from both rural and urban areas, and at all educational levels.


CONCLUSIONS
The decline in prevalence suggests declining incidence and that HIV control programs in Thailand are having an impact on the HIV epidemic.
Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand.
C J
CJ
Mason
L E
LE
Markowitz
S
S
Kitsiripornchai
A
A
Jugsudee
N
N
Sirisopana
K
K
Torugsa
J K
JK
Carr
R A
RA
Michael
S
S
Nitayaphan
J G
JG
McNeil
D000328:Adult; D015331:Cohort Studies; D003906:Developing Countries; D015658:HIV Infections / Q000453:epidemiology* / Q000517:prevention & control; D015528:HIV Seroprevalence / Q000639:trends*; D015497:HIV-1; D006801:Humans; D015994:Incidence; D008297:Male; D008889:Military Personnel / Q000706:statistics & numerical data*; D012424:Rural Population / Q000706:statistics & numerical data; D013785:Thailand / Q000453:epidemiology; D014505:Urban Population / Q000706:statistics & numerical data