Current Status of Soil-transmitted Nematode Infection in China
Abstract: Objective To Carry out national surveys for ascertaining the current status and trends of soil-transmitted nematode infections in China,providing scientific basis for forther developing control strategies.Methods In 1988-1992(hereinafter abbreriated as "survey in 1990"),a stratified cluster random sampling method was used in the survey.In 2001-2004(hereinafter abbreriated as "survey in 2003"),in order to compare with the survey in 1990,two-characteristic stratified cluster random sampling method was used and 687 investigation spots were sampled from the 2848 spots selected in the survey in 1990.Kato-Katz thick smear method was used to examine the eggs of soil-transmitted nematodes in fecal samples. Results The prevalence rates were 53.6% and 19.6% for soil-transmitted nematodes,14.6%and 6.120% for hookworms,44.6% and 12.7% for Ascaris lumbricoides,17.4% and 4.630% for Trichuris trichiura in survey 1990 and survey 2003,respectively.The prevalence rates of soil-transmitted nematodes were higher in 13 provinces than the average level in China in the survey in 1990.and higher in 8 provinces than the average level in the survey in 2003.The prevalence of hookworms,Ascaris lumbricoides,Trichurls trichiura and the overall prevalence of soft-transmitted nematodes were higher in females than in males.It is estimated from the results of survey in 2003 that the number of persons with soil-transmitted nematode infections in the country is about 129 million,less than that in the survey in 1990. Conclusion The prevalence of soil-transmitted nematodes has declined considerably but is still relatively high in some provinces and autonomous regions.Control activities and socioeconomic development may have contributed to the decreased prevalence.
|YING-DAN CHEN, LIN-HUA TANG, LONG-QI XU. Current Status of Soil-transmitted Nematode Infection in China[J]. Biomedical and Environmental Sciences, 2008, 21(2): 173-179.