We live in a semi rural area NO one sprays for the pest. Both hubby and I have been bitten by some sort of flying insect you don’t hear or see, and ended up on Predisone for the infections.
Then you have flea carrying critters, big cities are rat infested. Despite a Tax on your utility bill to pay for their eradication, they give you a few packets of rat bait. No real effort made to eliminate the vermin. Roaches too.
Spraying alone is useless since mosquitoes will never be eradicated. What they did in the case of malaria was find the infected mosquitoes and spray just those areas. Without testing, just spraying is detremintal.