Infection status of principal human parasites in Nanchang City in 2014

Abstract

Objective To understand and analyze the infection status of human parasites in Nanchang City, so as to offer a scientific basis for control of parasitic disease. Methods In 2014, a survey was performed according to the scheme ofThe 3rd National Survey of Principal Human Parasites. Intestinal parasites were surveyed among the residents in Jinxian County and Anyi County, Qingyunpu District and Qingshanhu District in Nanchang City, including the soil-transmitted nematodes (Ascaris lumbricoides, Trichuris trichiura and hookworm), Enterobius vermicularis, tapeworm and intestinal protozoa. Clonorchis sinensis was surveyed among the residents in Qingyunpu District and Qingshanhu District. Toxoplasma gondii was surveyed among the residents in two rural areas (Nanchang County and Xinjian County) and two urban areas (Donghu District and Xihu District). The ovums of the soil-transmitted nematodes, Clonorchis sinensis, tapeworm and other helminths were examined by the Kato-Katz, while Enterobius vermicularis among children was examined by cellophane anal swab, trophozoites and cysts of intestinal protozoa by saline smearing and iodine smearing, and IgG antibodies of Toxoplasma gondii by enzyme-linked immunosorbent assay (ELISA). Results Intestinal parasites were surveyed among 2 424 residents in the whole city, in which 2 414 residents were tested for the infection of soil-transmitted nematodes and tapeworm; 1 875 residents were tested for intestinal protozoa infection; 74 children were tested for eggs of Enterobius vermicularis; 539 residents were tested for Clonorchis sinensis; and 2 400 residents were tested for Toxoplasma gondii. Six kinds of intestinal parasites were found citywide, with a total infection rate of 9.49% (230/2 424). The infection rate of soil-transmitted nematodes was 8.70% (210/2 414), in which the infection rate of Ascaris lumbricoides was 0.04% (1/2 414), the rate of Trichuris trichiura was 0.91% (22/2 414), and of hookworm was 7.83% (189/2 414). The infection rate among 3-6 years old children of Enterobius vermicularis was 22.97% (17/74). Tapeworm and Clonorchis sinensis were not found. The infection rate of intestinal protozoa was 0.21% (4/1 875). The positive rate of Toxoplasma gondii's IgG antibody was 5.17% (124/2 400). Conclusions In Nanchang City, the infection rate of soil-transmitted nematodes (Ascaris lumbricoides, Trichuris trichiura) and intestinal protozoa was lower. However, the infection rates of hookworm, Toxoplasma gondii and Enterobius vermicularis among 3-6 years old children are increasing in local areas. That should be the focus in prevention and control of parasitic disease in the future. Key words: Parasite; Soil-transmitted nematodes; Clonorchis sinensis; Toxoplasma gondii; Data collection