The analysisis on the epidemiological characteristics of the soil-transmitted nematode infection at the national monitoring points in Sichuan from 2006 to 2010

Abstract

Objective To explore the time trend and the main influencing factors of soil-transmitted nematodiasis at the national monitoring points in Sichuan so as to provide scientific basis for control strategies.Methods The modified Kato's thick smear method and cellophane tape anal swab method were used to monitor the infection rate of soil-transmitted nematode infections in residents at monitoring points.The saturated sodium nitrate floating method was used to detect the roundworm egg contamination in soil samples collected.Results A population of 5616 (2725 male and 2891 female) was examined from 2006 to 2010.Soil-transmitted nematodes infection rates were 32.06％,14.4％,10.16％,3.21％ and 5.62％ from 2006 to 2010.The infection rates of roundworm,hookworm,and whipworm in male were 1.32％,11.16％ and 0.37％,while 1.56％,11.41％,0.42％ in female respectively.The infection rates of roundworm,hookworm,and whipworm declined from 2006 to 2010.Roundworm eggs in soil at vegetable garden,beside lavatory,courtyard and kitchen in 50 households were tested.The results were 6.0％,4.0％,2.0％ and 4.0％,respectively.There was no significant difference among the distributions of unfertilized eggs,fertilized eggs and live fertilized eggs in different locations.The fertilized roundworm eggs and live fertilized roundworm eggs found in soil decreased by years.Conclusion The infection rates of soil-transmitted nematodiasis in the national monitoring points in Sichuan decreased from 2006 to 2010.The contamination rotes of roundworm eggs in soil also decreased by years. Key words: Nematode infection; Soil-transmitted nematodes; Infection rate; Monitoring