Abstract: Objective     To analyze the surveillance results of schistosomiasis prevalence in a national surveillance site in Guichi District from 2015 to 2019 for evidence to develop strategies for prevention and control of schistosomiasis. Methods     According to the requirements specified in National Schistosomiasis Surveillance Scheme (2014 version), we conducted surveillance over Schistosoma japonicum infections in population and livestock, snails and wild feces in Guichi District from 2015 to 2019, and analyzed the surveillance results of schistosomiasis prevalence. Results     Totally, 4 297 local residents/times in the national schistosomiasis surveillance sites in Guichi District underwent serological examinations. Positive rate of blood test was decreased to 2.48% in 2019 from 7.22% in 2015. Serological studies performed in the floating population(a total of 1 274 individuals/times) showed that the positive rate was 8.00%, 11.5%, 7.58%, 4.42% and 7.91%, respectively from 2015 to 2019. No positive stool was found in the local and floating population. There were no local acute schistosomiasis infections, and no newly or reemerged cases of advanced schistosomiasis in the five years. Screening test was conducted in the feces from 92 pigs and 108 dogs, which showed no positive findings. A total area of 219.49 hm² was investigated for the snail infection, and 6 216 live snails were captured. The results showed that the density of live snails was 2.84, 1.08, 2.91, 2.14 and 0.88 snails /0.1 m², respectively. No infected snails were found. Conclusion     Generally, schistosomiasis endemic in Guichi District tends to decrease, yet the risk of transmission still exists. The findings suggest that the surveillance system on schistosomiasis still needs perfecting, and the sensitivity and level of surveillance should be improved in order to prevent resurgence of schistosomiasis. 

Key words: Schistosomiasis, Endemic situation, Surveillance, Guichi District