关键词: 三带喙库蚊, 乙脑病毒, 宿主动物, 感染

Abstract:

Objective To determine the species and density of Japanese encephalitis (JE) vectors and JE infections in the animal host in Huangshi city, Hubei province, providing the basis for development of JE prevention and control measures. Methods From April to October, 2008, mosquito species and density were monitored using the labor hour method, and JE antibody levels in pig serum were measured using the PCR in laboratory. Results The predominant mosquito species in Huangshi was Culex tritaeniorhynchus, followed by Cx. pipiens quinquefasciatus and Anopheles sinensis. Cx. tritaeniorhynchus accounted for 51.99% of the total captured mosquitoes with a density of 3.97/labor-hour. The mosquito density peaked in the second half of June, and remained stable from early July to the end of October. The average positive rate of JE antibody in pig serum was 6.2% with a maximum of 7.2%, which demonstrated an upward trend over time. Conclusion In view of the high density of Cx. tritaeniorhynchus, a vector of JE, in Huangshi, Hubei, and the infection rate among the host animal pigs increasing with the mosquito density, there was a natural environment for the spread of JE.

Key words: Culex tritaeniorhynchus, Japanese encephalitis virus, Host animal, Infection