Endemic situation of schistosomiasis in a surveillance site of river and lake regions in Haining City, 2012-2014

Abstract

To understand the endemic dynamics and situation of schistosomiasis in a provincial surveillance site in Haining City, Zhejiang Province. The Oncomelania hupensis snail status, schistosome infection situations of permanent residents and floating population in Qinmin Village, Haining City were monitored from 2012 to 2014 according to The Surveillance Programs of Schistosomiasis in Surveillance Sites of Zhejiang Province. Totally 600 permanent residents were examined from 2012 to 2014. The total positive rate of the serum antibody against Schistosoma japonicum was 3.17% (19/600). The rates in each year were 2.50% (5/200), 0 (0/200), and 7.00% (14/200), respectively, and the rate in 2014 were significantly higher than that in 2013 (χ2 = 14.508, P < 0.01), but no positives were found in the fecal examination. Totally 1 591 floating population were involved in the surveillance, the positive rate of serum antibody were 0.94% (15/1 591). The rates in active surveillance and passive surveillance were 0.92% (14/1 521) and 1.43% (1/70), respectively, and there were no statistically significant difference between them (χ2 = 1.659, P > 0.05). The positive rates of serum antibody among each year were 1.50% (8/534), 0.56% (3/531), and 0.76% (4/526), respectively, and the difference was not statistically significant (χ2 = 2.752, P >0.05), but no positives were found in the fecal examination. The snail surveillance showed that there were no environments with infected snails and imported snails. There exist the infection sources of schistosomiasis in Haining City. Therefore, we should be on high alert for the potential of local endemic of the disease. Meanwhile, we still should strengthen the snail surveillance as well as the infection surveillance among the floating population.