Results 36% (CI 32% to 42%) reported UAS at least once during the last 3 months.36% (CI 32% to 41%) had ever taken an HIV test and received the result.We aimed to analyse detailed sexual behaviour data among MSM in Vietnam and to model HIV transmission using improved assumptions on sexual network structure.
The study highlights the importance of collecting data on frequency of UAS acts and indicates the need to rapidly scale-up HIV prevention services and testing opportunities for MSM in Vietnam.
Men who have sex with men (MSM) are at high risk of HIV infection in all regions globally.1–4 Rapid increases in HIV prevalence rates have recently been documented from cities in Southeast Asia.5 HIV prevalence rates in cross-sectional surveys among MSM in Bangkok rose from 17% to 31% between 20.6 Similar increases have been recorded among MSM in Vietnam, where HIV prevalence rates in Hanoi and Ho Chi Minh City (HCMC) were reported at 9% and 5%, respectively, in 2005 and at 15% and 17%, respectively, in 2009.7–9 Sexual HIV transmission dynamics in these MSM populations are not well known and need to be characterised to inform HIV prevention strategies.
The results indicated rapid transmission over a wide range of values of per-act transmissibility.
Conclusions Men with multiple partners had unexpectedly high UAS frequency per partner, paired with low HIV testing rates.
Bengtsson 22 provide a detailed description of the sampling method.
Nine hundred and sixty-nine non-seed submissions were received during the study.
Objectives Survey data from men who have sex with men (MSM) in Asian cities indicate ongoing and drastic increases in HIV prevalence.
It is unknown which behavioural factors are most important in driving these epidemics.
After the survey, participants were encouraged to provide their email or Yahoo!
Messenger address and were sent four invitation messages to forward to MSM friends.
The number of ways in which ego-networks can be connected-up is however very large, with widely different implications for population-level transmission and the effectiveness of prevention interventions.18 19 We seek to meet these challenges by using new ways to collect and analyse detailed sexual behaviour data among Internet-using MSM in Vietnam.