Objective   To discuss the effect of the Mosq-ovitrap on vector surveillance, and to find a relationship between dengue fever(DF)prevalence and the Mosq-oviptrap Positive Index during dengue fever outbreak.

  Methods   Cases met the criteria for dengue fever were searched by an epidemiologic investigation.Mosquito density was mo nitored by Mosqo vitrapes set in the field, and the female adults were collected and admitted for DF virus tested using method of TaqMan MGB Real-time PCR.

  Results   After confirmed dengue fever outbreak with laboratory test and epidemiologic investigation, rapid implementation of dengue fever control protocols with emergency mosquito control measures were applied to limit disease dissemination.The adult mosquito density, Mosq-ovitrap Positive Index was reduced to 4.5~10.3 compared with 50.8~61.0 in untreated community.The test for dengue virus in mosquitoes caught was negative.The Breteau Index was reduced from 65.2 to 5~10 after a week for the emergency treatment.Overall, 34 cases were recorded with initial case on Sep 10, and the outbreak was haled 21days afterintegrated control measures application.

  Conclusion   The Mosq-ovitrap has shown the safe, efficient and feasible method for vector surveillance, especially for evaluating emergency control programmes and catching adult mosquitoes for virus detection.That Mosq-ovitrap Positive Index is lower than 5 can be as threshold of dengue fever control needs further research.