As many as 8,691 houses from eight zones in the city were found to be mosquito breeding grounds in a dengue survey conducted by the BBMP on Friday.
Teams comprising two nurses, a mosquito control gangman and a link worker visited 2,74,421 houses and checked tanks, buckets and other containers that might have freshwater stored.
Dr Devaki Umesh, Chief Health Officer, BBMP told Express that these sources that hold water were emptied, sprayed and members of the household were educated on the precautionary measures that need to be taken to prevent them from turning in a breeding ground for mosquitoes.
The campaign focused on low-lying areas where more cases of dengue positive cases were reported.