Analysis of mosquito ecological surveillance results in Hainan Province,China,2020-2022
Objective To investigate the distribution of mosquito vectors in Hainan Province,China from 2020 to 2022,so as to provide common mosquito ecological surveillance data for analyzing the risk of transmission of imported mosquito-borne diseases after the initiation of China(Hainan)Pilot Free Trade Zone operations.Methods In 18 cities(counties)across the province throughout the years,adult mosquitoes were monitored using the light trap method and the double-layered mosquito net method,and larval mosquitoes were monitored using the Breteau index(BI)method.With the use of R 4.3.1 software,one-way analysis of variance(ANOVA)was performed to compare the mean values of different mosquito populations in different years and regions,and if the difference was significant,the least significant difference method was used for further pairwise comparison.Results From 2020 to 2022,a total of 12240 lamps were set across Hainan Province,and 41087 female mosquitoes were captured.The density of mosquitoes was 3.36 mosquitoes/light·night.The annual density fluctuated between 1.59 and 4.55 mosquitoes/light·night,and was significantly different in different years(F=4.810,P=0.015).The net trap index for Aedes was 0.90 mosquitoes/net·hour.The annual fluctuated between 0.06 and 1.74 mosquitoes/net·hour,and there was no significant difference in the mean net trap index of different years(F=2.697,P=0.082);The BI for Aedes larvae was 4.13.The annual BI fluctuated between 2.13 and 6.60,and the mean BI showed no significant difference between different years(F=2.969,P=0.065).The mosquito density by the light trap method showed an obvious seasonal pattern,which was higher in summer than in winter;the density of Ae.albopictus also showed obvious seasonality,which was lowest during December to next February,and then increased to high levels during June to August,followed by a downward trend after August.There were significant differences in the mean annual values of adult mosquito density(F=7.758,P<0.001)and BI(F=11.630,P<0.001)between different dry and wet climate zones,but the net trap index showed no significant difference(F=1.977,P=0.113).Conclusions The annual mosquito density,net trap index and BI were all at a low level in Hainan Province from 2020 to 2022,but mosquito density were high in some areas.It is necessary to pay close attention to the mosquito vector density after the closure of the free trade port,and strengthen the surveillance of the vector mosquitoes.
NETL
NSTL
万方数据
