[Surveillance and forecast for schistosome infectivity of Yangtze River and Hanbeihe River during flooding in Hubei Province].

Objective: To investigate the schistosome infectivity of the water body of the Yangtze River and Hanbeihe River during flooding in Hubei Province.

Methods: The Oncomelania snail status was investigated in 17 sites of the Yangtze River and Hanbei River, and the infectivity of schistosome in sentinel mice was also determined.

Results: In the Yangtze River and Hanbei River, the average densities of living snails were 0.35 snails/0.1 m2 and 0.67 snails/0.1 m2 respectively, and the average infection rates of snails were 0.33% and 0.05%, respectively. The sentinel mouse surveillances were carried out twice in 10 sites of the Yangtze River. During the first surveillance the infection rate was 5.5% with 4 positive environment sites, and that was 5.5% with 7 positive environment sites in the second surveillance. The sentinel mouse surveillance was carried out once in 7 sites of the Hanbeihe River, and the infection rate was 11.9% with 4 positive environment sites.

Conclusions: By monitoring schistosome infection of the water body, we can understand the threat of environment and provide warning information to prevent from the outbreak and spread of acute schistosomiasis. We can also indirectly get many messages about the quality of snail investigation and the effect of mollusciciding.