Spread of west nile virus map

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Minus Related Pages. CDC Disease Maps. Mosquitoes that act as a vector carry the virus and pass it on when feeding on hosts like birds, livestock, other animals, and people. The small circles on this map represent uninfected crows reported in Black dots indicate infected crows, while larger dots reflect a higher concentration of infected crows in one area.

Researchers with INTREPID have been developing information products and databases derived from satellite data to show nationwide temperatures, distributions of vegetation, bird migration routes, and areas pinpointing reported cases.