Farmland Soil Contamination of Live Ascaris Lumbricoides Egg and its Causing Factors in Yunnan

Objective To understand the status of live ascaris lumbricoides egg contamination in farmland soil and its causing factors in Yunnan.

Methods The survey was conducted in 892 administrative villages from 45 counties in Yunnan, and 892 soil samples were collected according to the Technical Scheme for Monitoring the Project of National Rural Environmental Health in 2013. Live ascaris lumbricoides egg was detected by the method of floating egg with saturated nitrate. All data were analyzed by SPSS 17.0.

Results The detection rate for ascaris lumbricoides egg was 46.5% in all samples, the average count of ascaris lumbricoides egg was 1.7(0.5, 4.3)/of positive soil samples, and the detection rate for live ascaris lumbricoides egg was 30.9% in all samples, the average count of live egg was 1.0(0.3, 3.0)/gram of positive soil sample. Chi-square test showed that the mode of collecting domestic wastes, the texture of soil, whether a system on environmental health management has been established, if any special plan on environmental health has been done, whether the health education has been carried out, and the presence or absence of investment on environmental health were related to the detection rate of live ascaris lumbricoides egg in farmland soil(P < 0.05), but the humidity, pH of soil and plant roots in soil were not considered relating with the detection rate of live ascaris lumbricoides egg in farmland soil(P > 0.05). Multiple stepwise Logistic regression analysis showed that the mode of collecting domestic wastes and whether a system of environmental health management has been established were significantly negative correlated with the detection rate of live ascaris lumbricoides egg in farmland soil(P < 0.05).

Conclusions The detection rate of ascaris lumbricoides egg and live ascaris lumbricoides egg in farmland soil in Yunnan was still high. The detection rate of live ascaris lumbricoides egg was decreased with establishing a system on environmental health and unified collecting domestic garbage; so the work on creating 'Advanced Sanitary Model Villages' should be vigorously promoted in rural areas.