Dead crows which show no obvious sign of physical injury should be reported to the county health department. Although crows seem to be particularly susceptible to West Nile virus, other types of birds can carry the infections. Reduce or eliminate all standing water. Dispose of tin cans, plastic containers, or similar water-holding containers. Remove all discarded tires on your property.
Used tires are common mosquito breeding sites.
Drill holes in the bottom of recycling containers that are kept outdoors. Make sure roof gutters drain properly and clean clogged gutters. Turn over plastic wading pools and wheelbarrows when not in use. Change the water in birdbaths. Clean vegetation and debris from the edge of ponds.