 MSM in particular have seen a significant increase in transmission rates since epidemiological studies examining them as a group began in 2000.MSM represented 26% of new reported cases in 2014, up from 2.5% in 2006.Increased migration from poorer regions with high HIV prevalence to urban areas and somewhat liberalized attitude towards homosexuality in China over the last two decades, resulting in more overall sexual activity, have been hypothesized as factors driving this trend.