Analysis on results of investigation on soil-transmitted nematode infections at the surveillance sites in Jiangsu from 2006 to 2010

Abstract

Objective Objective To analyze the prevalent trend of soil-transmitted nematode infections at the surveillance sites in Jiangsu Province from 2006 to 2010.Methods The national surveillance site of soil-transmitted nematode infections was located in Huaji village of Shuyang County in Suqian City.There were eighty three provincial and municipal level surveillance sites.From 2006 to 2010,fecal samples of the residents of 3 years old and above were collected in every autumn and the intestinal helminth eggs were examined with the modified Kato-Katz thick smear technique.Soil samples which were also collected from vegetable fields,lavatory,courtyard and kitchen of 10 randomly selected families with stool egg-positive,were examined for Ascaris eggs by a modified saturated sodium nitrate floated method.Cellophane tapes were applied to detect pinworm eggs for children aged 3-12 years old.Results The infection rates of soil-transmitted nematode in residents and pinworm in children at the Shuyang County surveillance sites reduced from 1.81％(19/1049) and 4.72％ (5/106) in 2006 to 1.23％ (13/1061) and 0(0/90) in 2010 respectively,and infection rates of soil-transmitted nematode and pinworm decreased 32.04％ and 100％ respectively.The infection rates of soil-transmitted nematode in residents and pinworm in children also showed a downtrend in other surveillance sites,from 2.61％ (2547/97405) and 2.42％ (3187/131 965) in 2006 to 0.84％ (900/107 233) and 0.95％ (1 015/106 959) in 2010 respectively,The infection rate of soil-transmitted nematode and pinworm decreased 67.82％ and 60.74％ respectively.The infection intensity in all infected people was light.None of Ascaris eggs was found in all 200 soil samples from 50 families.Conclusion The infection rates of soil-transmitted nematode in residents and pinworm in children showed a decreased trend and kept a low level of prevalence in Jiangsu Province during 2006-2010. Key words: Nematode infection; Jiangsu province; Soil-transmitted nematode; Surveillance site