Control of clonorchiasis sinensis in Shandong Province during past forty years / 中国血吸虫病防治杂志

ABSTRACT

Objective To understand the achievements of clonorchiasis sinensis control in Shandong Province during the past forty years. Methods The data of the previous annual clonorchiasis sinensis investigation in Shandong Province were collected and analyzed. Results From 1960s to 1970s, there were 107 counties existing the prevalence of clonorchiasis sinensis in Shandong Province. The infection rate of population was 1.51%, and 85.70% of the infected people were children below fifteen years old. Through the forty years' control, the decreasing of intermediate hosts such as various kinds of fishes and water-snails due to 85. 00% of ditches and ponds dried up by the lasting drying weather after 1980s, and 90. 00% of rivers polluted by increasing liquid waste, as well as the decreasing of infective chances due to 97. 90% of people breaking off the habit of eating not-well-cooked fishes by popularizing health knowledge, to 2003, the population infection rate dropped to 0.04%, 95.60% of the village where residents had the infection dropped to below 1. 00% , and 60. 00% of counties where no Clonorchis sinensis infection was found. Conclusion The clonorchiasis sinensis transmission areas reduce gradually, the infection rate of population decreases to the lowest in the history and the transmission has been controlled in Shandong Province.