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 of Ae. 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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