Objective To ascertain the prevalence of soil-transmitted nematodes in Yunnan Province. Methods Study sites in twelve counties of Yunnan Province were determined by clustered random sampling,and fecal samples were collected from residents age 3and above from 2012 to 2014.Feces were checked for the eggs of roundworms,hookworms,whipworms,or tapeworms using the Kato-Katz method.The number of eggs per gram(EPG)of feces was calculated.Results were compared to results from 1992 and 2003.Samples were also collecte...