The surveillance on soil-transmitted nematode infections in Zhejiang Province during 2005-2010

Abstract

Objective To analyze the current status and trends of the soil-transmitted nematode infections in Zhejiang Province from 2005 to 2010 and provide scientific evidence for the prevention and control strategy.Methods Stool samples were collected from local residents recruited from Qujiang,Pinghu,Jingning,Kai hua and Songyang in Zhejiang Province.Modified Kato-Katz method was used to examine eggs of Ascaris,hookworm,Trichuris trichiura,and the method of cellaphane analswab was used to examine eggs of Enterobius for 3-12years old children.The surveillance data of soil-transmitted nematodes from 2005 to 2010 were collected and analyzed.Results Fecal smears examination was conducted on 7 442 people cumulatively,the infection rate of soil-transmitted nematodes was 1.30％,2.36％,6.07％,8.08％,4.80％ and 1.19％ from 2005 to 2010,respectively.The infection rate of soil-transmitted nematodes was significantly lower in 2010 than those from 2006 to 2009(x2=4.553,P ＜ 0.05;x2=58.023,P ＜ 0.01;x2=94.399,P ＜ 0.01;x2=45.855,P ＜ 0.01).The infection rate in Kaihua was significantly lower in 2010 than those from 2007 to 2009 (x2=108.957,P ＜ 0.01;x2=116.892,P ＜0.01;x2 =43.394,P ＜ 0.01),and the infection rate in Jingning was significantly higher in 2008 than the results of 2006 and 2007 (x2 =4.376,P ＜ 0.05;x2 =4.858,P ＜ 0.05).The infection of hookworm was the main type of infection in the two areas.Conclusion The overall infection rate of soil-transmitted nematodes showed a decline trend in Zhejiang Province,but the infection rate of hookworm was still high in some areas.The epidemic situation of soil-transmitted nematodes has been controlled basically in Zhejiang Province. Key words: Nematode infection; Soil-transmitted nematodes; Infection; Surveillance