Endemic situation of schistosomiasis in a national surveillance site of Yangzhong City from 2015 to 2018 / 中国血吸虫病防治杂志

ABSTRACT

Objective To analyze the endemic situation of schistosomiasis in a national surveillance site of Yangzhong City, so as to provide the scientific evidence for adjusting the local schistosomiasis control strategy and consolidating the control achievements. Methods According to the National Schistosomiasis Surveillance Scheme (2014 version), the snail status, Schistosoma japonicum infections in humans and livestock and wild feces contamination were monitored in Zhinan Village, a national schistosomiasis surveillance site in Yangzhong City from 2015 to 2018. Results Theareasofsnailhabitatsreducedfrom 8.10 hm2 in 2015 to 2.72 hm2 in 2018, and the mean density of living snails decreased from 0.27 snails/0.1 m2 in 2015 to 0.07 snails/0.1 m2 in 2018 in Zhinan Village; however, no S. japonicum infections were identified in snails during the period from 2015 to 2018. Serological testing for S. japonicum infections was performed in 2 034 local populations and 858 mobile populations from 2015 to 2018, and the sero-prevalence of S. japonicum human infections was 0.59% to 1.98%, with no egg-positives detected. A total of 79 goats were detected for S. japonicum infections from 2015 to 2018, and no egg-positives were found. In addition, no other livestock was found in Zhinan Village from 2015 to 2018, and no wild feces were found in snail habitats. Conclusions A great success has been achieved in schistosomiasis control in Yangzhong City; however, there are still snails breeding in the city. Monitoring of the risk factors pertaining to schistosomiasis transmission should be further intensified to consolidate the control achievements.