Abstract:

Objective To analyze the situation of schistosomiasis in recent years, and assess the risk of he achievment of schistosomiasis interruption in the district of Ma'anshan City in 2015. Methods From 009 to 2013, the prevalence of people and livestock was monitored by the combination of the immunological nd etiological methods. The snails were surveyed by systematic and environmental sampling methods. eanwhile, schistosomiasis control measures were carried out through human and livestock chemotherapy and nail control. Results From 2009 to 2013, 2 060 people were treated and received expanded chemotherapy. 0 622 people were screened by IHA with the average positive rate of 3.75%, which wandered in the steady tate. 1 526 people were examined by Kato-Katz with no positive. 279 livestock were expanded treated, 231 ere tested witj no positive in the 5 years. The area of snail control by molluscicides was 611.3 hm2, and nvironmental modification was implemented in an area of 10.7 hm2. The snail distribution was surveyed in an rea of 3 152 hm2, and no infected snail was found. The density of living snails decreased from 0.205/0.11m2 n 2009 to 0.007 5/0.11m2 in 2013, and the snail area in 2013 declined 44.1% than that in 2009. Conclusion The endemic situation of schistosomiasis in the district of Ma'anshan city declined gradually since 2009. No patient, no infected livestock and no infected snails were found in the 5 years. The density of snails and the area of living snails decreased year by year, and the gap to achieve the goal of schistosomiasis interruption was
gradually narrowing. At present, the main obstacle was the large area of snails in the district.

Key words: Schistosomiasis, Interruption, Risk assessment, District of Ma'anshan city