Modeling HIV transmission risk among Mozambicans prior to their initiating highly active antiretroviral therapy.
Understanding sexual behavior and assessing transmission risk among people living with HIV-1 is crucial for effective HIV-1 prevention. We describe sexual behavior among HIV-positive persons initiating highly active antiretroviral therapy (HAART) in Beira, Mozambique. We present a Bernoulli process model (tool available online) to estimate the number of sexual partners who would acquire HIV-1 as a consequence of sexual contact with study participants within the prior three months. Baseline data were collected on 350 HAART-naive individuals 18-70 years of age from October 2004 to February 2005. In the three months prior to initiating HAART, 45% (n = 157) of participants had sexual relationships with 191 partners. Unprotected sex occurred in 70% of partnerships, with evidence suggesting unprotected sex was less likely with partners believed to be HIV-negative. Only 26% of the participants disclosed their serostatus to partners with a negative or unknown serostatus. Women were less likely to report concurrent relationships than were men (21 versus 66%; OR 0.13; 95%CI: 0.06, 0.26). Given baseline behaviors, the model estimated 23.2 infections/1,000 HIV-positive persons per year. The model demonstrated HAART along with syphilis and herpes simplex virus type 2 (HSV-2) treatment combined could reduce HIV-1 transmission by 87%; increasing condom use could reduce HIV-1 transmission by 67%.
Pearson
C R
CR
Department of Health Services, School of Public Health, University of Washington, Seattle, WA 98105-1525, USA. pearsonc@u.washington.edu
Kurth
A E
AE
Cassels
S
S
Martin
D P
DP
Simoni
J M
JM
Hoff
P
P
Matediana
E
E
Gloyd
S
S
D000328:Adult; D000368:Aged; D023241:Antiretroviral Therapy, Highly Active; D004812:Epidemiologic Methods; D005260:Female; D015658:HIV Infections / Q000208:ethnology / Q000517:prevention & control / Q000635:transmission*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D008875:Middle Aged; D009073:Mozambique / Q000453:epidemiology; D015995:Prevalence; D012725:Sexual Behavior / Q000208:ethnology* / Q000523:psychology / Q000706:statistics & numerical data