I presume they used insecticides. Anyone know what they used?
replies(5):
pyrethroids (e.g., permethrin),organochlorines (e.g., DDT); carbamates (e.g., bendiocarb); and organophosphates (e.g., malathion)
Pyrethroids are most often in bed nets, insecticide impregnated clothing, etc. How and what to apply these chemicals to is the subject of a lot of ongoing research.
Beyond this, there's just things like finding and eliminating mosquito breeding sites.