[Surveillance of soil-borne nematodiasis in Danyang City from 2012 to 2018].

Objective: To monitor the epidemic status of human soil-borne nematodiasis in Danyang City, so as to provide scientific evidence for formulating control measures.
Methods: The soil-borne nematode infections were tested using a modified Kato-Katz technique among residents aged more than 3 years living in Danyang City from 2012 to 2018, and the Enterobius vermicularis eggs were detected using the transparent adhesive tape anal swab method among children at ages of 3 to 12 years.
Results: A total of 13 540 residents were monitored for soil-borne nematode infections from 2012 to 2018, and the prevalence of human soil-borne nematode infections was 0.45%. The prevalence of Ascaris lumbricoides, Trichuris trichura and Enterobius vermicularis infections was 0.32%, 0.12% and 0.01%, respectively, and a single parasite infection was predominant. There were significant differences in the prevalence of soil-borne nematode ( χ ² = 42.610, P < 0.05), A. lumbricoides ( χ ² = 26.276, P < 0.05) and T. trichura ( χ ² = 20.692, P < 0.05). The prevalence of human soil-borne nematode infections was 0.45% in males and 0.47% in females, and lower prevalence was found in local residents than in floating population (0.28% vs. 0.66%; χ ² = 10.561, P < 0.05). The highest infection was found in subjects at ages of 31 to 40 years (0.59%), followed by in subjects at ages of 41 to 50 years (0.56%), and the lowest infection was seen in children at ages of 3 to 5 years (0.27%). In addition, the prevalence of human soilborne nematode infections varied significantly in occupation ( χ ² = 75.692, P < 0.05), with the highest infection seen in boatmen. Among the 5 078 children monitored, the prevalence of E. vermiculari s infection was 0.37%, and the prevalence of E. vermicularis infection varied significantly in year (χ ² = 15.466, P < 0.05).
Conclusions: The human soil-borne nematode infection is at a low level in Danyang City; however, the surveillance of soil-borne nematodiasis remains to be intensified in children living in rural areas and immigrant populations.