a decreasing trendP = 0.01
There was a decreasing trend in the seroprevalences of HBsAg, anti-HCV, and anti- T. pallidum from 2012 to 2015 ( P -value for trend, P = 0.01, P < 0.0001, P < 0.0001, respectively), while the seroprevalence of HIV increased ( P = 0.049).