If your flock has succumbed to the virus, you should clean waterers daily during an outbreak. Throw away any remaining water once your hens are shut in the coop for the night. One of the best things a poultry keeper can do to reduce mosquito populations is eliminate any standing water which is where mosquitoes breed. Standing water is more common than you may first believe: bird baths, ponds without fish, hollow trees, paddling pools, blocked gutters, any open container that can hold water — even a discarded sweet wrapper manages to trap enough water to hold mosquito eggs. Clean the coop and run thoroughly with the objective of removing any scabs that have fallen off as these are still contagious.