The assay was used in HIV/AIDS surveillance sentinel sites to identify recent HIV-1 infection, to estimate HIV-1 incidence and understand the epidemic trends among men who have sex with men during 2011-2015. During 2011-2015, the HIV-1 incidence of men who have sex with men was 5.16%(95%CI: 4.65%-5.66%) in Sichuan Province. According to<Pilot study on classification criteria of AIDS epidemic in China>, a total of 9 cities had been divided into two type of regions: the first type(the proportion of live HIV/AIDS accounts for more than 0.1% of the permanent population, and the number of live HIV/AIDS has reached 500 cases and above) and the second type(the proportion of live HIV/AIDS accounts for 0.03% to 0.100% of the permanent population, and the number of live HIV/AIDS has reached 100-500 cases). During 2011-2015, the HIV-1 incidence of the second type was 4.24% (95%CI: 3.72%-4.76%). The HIV-1 incidence of men who have sex with men was at a high level. The spread of HIV-1 to the second region was possible.
对2011—2015年四川省9个市（州）艾滋病监测哨点的男男性行为人群（MSM）开展新发感染检测，估算该人群HIV-1的感染率和新发感染率。2011—2015年四川省MSM HIV-1新发感染率为5.16%（95%CI：4.65%~5.66%）。根据《中国艾滋病流行水平分类标准（试行）》将9个市（州）分为一类（即报告现存活HIV/AIDS数占常住人口比例达到0.1%及以上，报告现存活HIV/AIDS数达到500例及以上）和二类（即报告现存活HIV/AIDS数占常住人口比例达到0.03%~0.100%，报告现存活HIV/AIDS数达到100~500例），二类地区新发感染率为4.24%（95%CI：3.72%~4.76%）。四川省2011—2015年MSM HIV-1新发感染率较高，并存在疫情向二类地区蔓延的可能。.
Keywords: Acquired immunodeficiency syndrome; Epidemiology; HIV-1; Incidence; Men who have sex with men.