Fig. 4From: Environmental risk factors and changing spatial patterns of human seropositivity for Echinococcus spp. in Xiji County, Ningxia Hui Autonomous Region, ChinaSpatial distribution of predicted seropositivity for Echinococcus multilocularis in schoolchildren aged 6–18 years and standard deviations in 2002–2003 (a, d), 2006–2007 (b, e) and 2012–2013 (c, f) in Xiji County, NHAR, ChinaBack to article page