[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.

[Surveillance of schistosomiasis in Hubei Province in 2010].

OBJECTIVE: To understand the endemic situation of schistosomiasis in surveillance sites of Hubei Province in 2010. METHODS: According to The Scheme of Schistosomiasis Surveillance in Hubei Province, 207 endemic villages were selected as surveillance sites, where the surveys of residents, livestock and Oncomelania snails were carried out. RESULTS: In the 207 surveillance sites, the infection rates of residents and cattle were 1.01% and 1.14%, respectively, the densities of living snails and infected snails were 0.50 and 0.000 4 snails/0.1 m2, respectively, and the infection rate of snails was 0.08%. CONCLUSIONS: Compared with that in 2009, the endemic situation of schistosomiasis in Hubei Province in 2010 has decreased obviously, but as the repeatability of the disease, the control of infectious sources and the management of cattle should be strengthened, as well as the snail control.