Objective To investigate the effect of rainfall on the accumulation of water in rainwater wells and the breeding of Aedes albopictus, and to provide a basis for dengue fever prevention and control. Methods From July 26 to August 25, 2019, 105 rainwater wells in a residential community of Songjiang district, Shanghai, China were selected to investigate the water accumulation and mosquito breeding on days 1, 3, 6, 9, 12, 15, 20, and 30. ArcGIS 10.8 was used for spatial analysis and Stata 14.0 was used for negative binomial regression analysis. Results Of the 105 rainwater wells, 22 were flooded 8 times, 77 were flooded 1-7 times, and 6 were not flooded. Of the 99 flooded wells investigated using the juvenile mosquito spoon trap method, 69 were positive for Ae. albopictus breeding (one or more records of Aedes breeding), and 36 were negative for Ae. albopictus breeding. Negative binomial regression analysis showed that mosquito breeding was statistically associated with turbidity of water in rainwater wells (Z=-4.423, P<0.001) and total rainfall during the first seven days (Z=-7.874, P<0.001) and from day 8 to day 14 (Z=6.166, P<0.001) before the survey day of the eight surveys. There was no statistical correlation between mosquito breeding and the number of water logging (Z=1.342, P=0.179). Conclusion The rainwater wells were generally flooded in Shanghai, and mosquito breeding in rainwater wells was related to turbidity of water, total rainfall from day 1 to day 7 prior to the survey, and total rainfall from day 8 to day 14 prior to the survey. Investigation and control of juvenile mosquito density in rainwater wells should be carried out to reduce the risk of dengue fever transmission.
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