Warming temperatures can encourage mosquito-borne outbreaks, and more global travel risks moving the bugs and their diseases to new areas. Lyme disease is the most common tick or mosquito–borne disease in the U.S. West Nile virus and other mosquito-related infections spread cyclically but unpredictably, in part because of the mosquito’s short lifespan. How West Nile spread across the U.S. The spread of West Nile virus often relies on infected migrating birds.

Source: Wall Street Journal May 26, 2023 15:57 UTC