Survey of the Status of Soil-Borne Nematode Infection in Shenzhen in 2010-2011

Objective To understand the status of soil-borne nematode infection in Shenzhen and provide scientific basis for control strategy. Methods The survey was targeted on the permanent residents over 3 years old. Modified Kato Katz's thick smear was used to detect the soil-borne nematode eggs such as ascaris,whipworm,hookworm and threadworm in the feces. The data of infection rate and infectiosity were analyzed. Results A total of 3 935 persons were investigated in 5 districts.19 were infected and the mean infection rate of soil-borne nematode was 0.48%,of which the infection rates of ascaris,whipworm,hookworm and threadworm were 0.13%,0.28%,0.05% and 0.03%,respectively.EPGs of ascaris, whipworm and hookworm infected persons were 242,81.6 and 120, respectively,and all were mild infection. The district with the highest infection rate was Baoan(0.86%),and the district with the lowest infection rate was Futian(0.13%).Differences between the infection rates of different districts was not statistically significant (χ2=6.81,P0.05).The average infection rates of male and female were 0.56% and 0.40%, respectively. Difference between the infection rate in different gender was not statistically significant(χ2=0.59,P0.05). Analysis of the age distribution revealed that the highest score was found in the age group of less than 20 years old (0.55%),20- years old(0.60%) and 30-years old(0.65%). Conclutions The status of soil-borne nematode infection in Shenzhen was at a lower level.The infection rate of soil-borne nematode was lower than the infection rate in the current-status survey of human important parasitic diseases of Guangdong province in 2001-2004.