[Surveillance of Anopheles populations in different periods in Suizhou City].

Objective: To evaluate the effect of malaria vector control measures so as to provide the evidence for consolidating the control effectiveness of malaria and carrying out the vector surveillance in Suizhou City.
Methods: The distributions of Anopheles sinensis and An. anthropophagus were investigated by the combination of retrospective review and field survey. The changes of density and population of mosquito vectors were investigated and compared among various years.
Results: From 1985 to 1996, both An. sinensis and An. anthropophagus were found in 18 towns, and An . anthropophagus mosquitoes accounted for 52.3% of the total Anopheles mosquitoes. Only An. sinensis mosquitoes were found in other 26 towns. In 2003 and 2004, An. anthropophagus mosquitoes were found in the original 18 towns, and they accounted for 47.0% and 38.1% respectively, but in 2005, An. anthropophagus mosquitoes were not found in this city. However, the density of An. sinensis presented an upward trend.
Conclusions: An. anthropophagus population has gradually disappeared in Suizhou City, and currently, An. sinensis is the main Anopheles population, which might be the malaria vector in suitable conditions. Therefore, the surveillance and control of Anophe les vector should be strengthened in order to consolidate the achievements of malaria elimination.