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Liangshan Prefecture in Sichuan province, China, has a high prevalence of HIV infection, which is reflective of a change in the mode of transmission from injection drug use IDU to heterosexual intercourse. However, few studies focus on HIV-related heterosexual risk behaviours among the majority Yi population.
The objectives of this study were to explore the characteristics of an egocentric sexual network and estimate the prevalence of casual sexual behaviour. In-depth interviews and focus group discussions provided supplementary information on sexual norms. Most of the respondents reported having had casual sex at some time in their life, and Only During the study year, a total of partners were involved in sexual partnerships.
Among the reported sexual partnerships, Having never been married OR: 2. Size OR: 2. HIV-related interventions for the Yi ethnic minority in Sichuan province must therefore address concurrent sexual partnerships and promote condom use. It remains an epidemic of low overall prevalence 0. Analysis of surveillance data from Liangshan shows that members of the Yi ethnic minority accounted for the majority of infections and that, over time, the percentage of IDU accounting for HIV transmission decreased, whereas transmission by heterosexual sex increased.
With a population of 2. Explanations for variations in the timing and intensity of the HIV epidemic based on the rapid and pervasive spread among heterosexual populations in sub-Saharan Africa indicate that concurrent sexual partnerships exponentially increase the number of infected individuals and the growth rate of the epidemic during its initial phase. Sexual network analysis focuses on the sexual partnerships among individuals in a group using egocentric 9 , 10 , 11 and sociometric 12 , 13 , 14 , 15 perspectives.
Data for egocentric sexual networks can be collected anonymously. Currently, few studies have focused on casual sex among the Yi in Liangshan. To explore the characteristics of an egocentric sexual network and estimate the prevalence of casual sex among the Yi, we conducted a survey of Yi villagers during December Although China's HIV epidemic remains one of low overall prevalence, the rates in some counties in Liangshan including County A have risen rapidly.