Distribution characteristics and spatiotemporal aggregation of Aedes albopictus in Songjiang District,Shanghai,China,2017-2022
Objective To investigate the density distribution and spatiotemporal aggregation of Aedes albopictus in Songjiang District,Shanghai,China,so as to provide a reference for monitoring,early warning,risk analysis,and precise prevention and control of Aedes-borne infectious diseases.Methods Descriptive analyses were performed on Ae.albopictus larvae density data(mosq-ovitrap index,MOI)in 17 sub-districts and towns of Songjiang District of Shanghai from June to October,2017-2022.ArcGIS 10.8 and SaTScan 10.1.2 softwares were used to conduct spatial autocorrelation analysis and spatiotemporal scanning analysis,respectively.Results In 2017-2022,the density ofAe.albopictus in Songjiang District increased first and then decreased every year,with the peak in July and August.The top three regions by annual average density were Fangsong Sub-district,Sijing Town,and Chedun Town,and residential areas had the highest mosquito density among habitats.Spatial aggregation was found in the density distribution of Ae.albopictus in 2022(Moran's I=0.139,P=0.047);Ae.albopictus density showed local aggregation in Guangfulin,Yueyang,and Zhongshan sub-districts in 2018,in Guangfulin Sub-district,Yueyang Sub-district,and Dongjing Town in 2021,and in Yueyang,Zhongshan,and Yongfeng sub-districts in 2022;the aggregation hotspots in 2018 were observed in Zhongshan Sub-district and Chedun Town;and the aggregation hotspots in 2022 were observed in Zhongshan Sub-district,Yueyang Sub-district,and Chedun Town.Spatiotemporal scanning analysis indicated a class-Ⅰ gathering area involving Fangsong,Yueyang,Yongfeng,and Zhongshan sub-districts and Chedun Town(log-likelihood ratio was 68.61,relative risk was 2.66,P＜0.001).Conclusion The density distribution of Ae.albopictus was gradually aggregating towards central urban areas in Songjiang District from 2017 to 2022,and Fangsong,Yueyang,Yongfeng,and Zhongshan sub-districts and Chedun Town were the main areas of local aggregation.
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