[Survey on intestinal nematode infections among school students in Tengchong County].

One primary school and one middle school were selected from Gudong Town, Tengyue Town and Puchuan Township of Tengchong County, respectively, by using the lamination stochastic group sampling method. The intestinal parasite infections were investigated with the iodine-stained direct smear method and modified Kato-Katz thick smears method. A total of 1 134 students were investigated and the total infection rate of intestinal nematodes was 12.4% (141/1 134). The infection rate of Ascaris lumbricoides, Trichuris trichura, and hookworm was 9.4% (106/1 134), 2.8% (32/1 134), and 0.3% (3/1 134), respectively. The prevalence of intestinal nematodes among the students of urban (2.2%, 8/363) was lower than those of rural (17.3%, 133/771) (P < 0.01). The infection rate in students from Gudong Town was higher than those of Tengyue (2.2%, 8/363) and Puchuan County (2.3%, 8/35) (P < 0.01), whereas the economy level of Gudong Town (29.9%, 123/412) was the best in the three towns. After all, the infection rate of the middle school students (13.7%, 59/432) was higher than that of pupils (11.7%, 82/702) (P < 0.01). Compared with 2003, the prevalence of nematode infection among the school students in Tengchong County decreased significantly in 2013.