Investigation on the infection of intestinal helminth in rural district of Hebei Province,China

Objective To investigate the human infection of intestinal helminth in rural district of Hebei Province,and provide a scientific basis for making out measures of controlling parasitic infection.Methods 15 spots of 6 counties which had been selected in National investigation in 1990 were selected in current program,which is carried out in 2002 according to the unified requirements and standardized methods in the nationwide.Results All feces samples of 7 316 persons in 15 spots were examined by modified Kato-Katz thick smear method,and 5 species of intestinal helminth eggs were detected.Among them,there were 117 cases of Ascaris lumbricoides and the infection rate was 1.60%;7 cases of Trichuris trichiura and the infection rate was 0.10%;4 cases of Ancylostomatidae and the infection rate was 0.05%;3 cases of Trichostrongylus orientalis and the infection rate was 0.04%.In addition,4 cases of Enterobius vermicularis were found in the population.683 children under 12 years of age were examined by cellophane tape swab technique,134 of them were positive,and the infection rate was 19.62%.Conclusion Compared with the results of the first national investigation on distribution of human parasites,the infection rate of A.lumbricoides decreases mostly,its reduction rate was 94.97%.The infection rates of T.trichura and Ancylostomatidae were also greatly decreased.But the infection rate of E.vermicularis in children under 12 years of age was still 19.62%,it is only decreased by 26.43%.The results shows that infection of E.vermicularis is still serious,prevention and control should be strengthened in future.