There are ways of preventing standing water: no old tires laying around, keep the puddles small, basically don't let water stand around long enough for mosquito larvae to hatch. Stirring standing water will kill the larvae, as they have to have breathing tubes to the surface (really!). Spraying a light coat of oil on the water surface also works, as does detergents and surfactants. But that's in the towns and perhaps the suburbs. I can't see spraying a light coat of oil all over the bayous of Louisiana or the wetlands of Alaska, though.

Another nasty disease is West Nile virus. And Chikungunya, dengue, Rocky Mountain spotter fever, Heartland virus, Lyme disease, and of course good ol' plague (including the septicemic and pneumonoccal varieties. Stay away from insects and animals! Then there's hemorrhagic fever, rhinoviruses, and a lot of other airborne diseases.

Come to think of it, just seal up your house and stay inside for the rest of your life.