[Survey of human major parasitic diseases in Shixing County from 2002 to 2016].

OBJECTIVE: To analyze the results of 3 investigations (2002-2004, 2008-2009, and 2016) of major parasitic diseases in Shixing County, so as to provide the evidence for formulating further control strategies.

METHODS: With the stratified cluster sampling method, 5 administrative villages were investigated. A total of 200 residents aged above 3 years were sampled in each village to investigate the eggs of soil-transmitted nematodes with Kato-Katz technique, and the swab method was applied for detecting the eggs of Enterobius vermicularis in children aged 3-9 years. χ2 test was used for statistical analysis.

RESULTS: Totally 3 857 individuals were surveyed for intestinal parasites, and 5 species of parasites were found and the total infection rates were 28.37%, 4.32% and 0.50% in the 3 investigations respectively, and there were statistically significant differences between any two investigations ( χ2 = 287.64, 327.60 and 31.89 respectively, and all P ＜ 0.01). The infection rates of Ascaris lumbricoides , hookworm, Trichuris trichiura and Clonorchis sinensis significantly decreased in the third investigation compared with those in the first investigation ( χ2 = 424.55, 55.45, 43.40 and 26.12 respectively, all P ＜ 0.01). However, there was no significant difference between the E. vermicularis infection rates of the first investigation and the third investigation ( χ2 =0.16, P ＞0.05).

CONCLUSIONS: Compared with the status in the first investigation, the infection rates of A. lumbricoides , hookworm, T. trichiura and C. sinensis are significantly decreased by 90% or more in the third investigation. However, the children's infection rate of E. vermicularis is still very high. Therefore, we should focus on the comprehensive control measures of E. vermicularis infection while formulating further control strategies of parasitic diseases.