Report on surveillance of soil-transmitted nematode infections in Shanxi Province in 2011

Objective To understand the status of soil-transmitted nematode infections in Shanxi Province and provide scientific basis for prevention and control strategy and measures.Methods 12 surveillance sites located north of the city were randomly selected.Fecal samples of the inhabitants of 3 years old and above were collected and examined for intestinal nematodes eggs by modified Kato-Katz's thick smear technique.Infection rate and infection intensity were calculated.Results A total of 11 819 people were surveyed at 12 provincial surveillance sites and 119 people were infected with soil-transmitted nematodes including Ascaris,Trichuris and pinworm,the total infection rate was 1.01％.Among them,39 were infected with Arcaris,1 with Trichuris and 79 with pinworm,the prevalence of which were 0.33％,0.01％ and 0.67％ respectively.All of the people infected with pinworm were from Wanrong County in Yuncheng City.The prevalence of pinworm at Wanrong County site was 7.84％,the difference of which among different age groups was significant statistically(x2 =71.46,P＜0.05),and family clustering was found in 64.56％ (51/79) patients.Conclusion Total prevalence of soil-transmitted nematodes and Ascaris,Trichuris and pinworm in 2011 declined compared with the infection condition of the second survey on the status of important human parasitic diseases in Shanxi Province.The pinworm prevalence at Wanrong County site was far higher above average prevalence of the Second Survey in Shanxi Province.The results also showed that pinworm infection is a disease with the feature of high family clustering. Key words: Nematode infection;  Soil-transmitted nematodes;  Surveillance;  Report