Diseases spread by ticks, mosquitoes and fleas more than tripled in the U.S.

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Diseases spread by ticks, mosquitoes and fleas more than tripled in the U.S.

Clockwise from top left: The deer tick, which transmits Lyme disease; the American dog tick, which transmits Rocky Mountain spotted fever and tularemia; the Culex pipiens mosquito, which transmits West Nile virus; and the Aedes aegypti mosquito, which transmits Zika, dengue and chikungunya.

Diseases spread by ticks, mosquitoes and fleas more than tripled in the U.S.

Clockwise from top left: The deer tick, which transmits Lyme disease; the American dog tick, which transmits Rocky Mountain spotted fever and tularemia; the Culex pipiens mosquito, which transmits West Nile virus; and the Aedes aegypti mosquito, which transmits Zika, dengue and chikungunya.