Climate change is causing milder winters, warmer summers, and fewer frost days. This change in climate makes it easier for many animals, mosquitoes, ticks, and the infectious diseases they spread to expand into new geographic areas and infect more people.

To understand climate change's impact, it's important to look at some of the common ways these diseases spread—through mosquito and tick bites, contact with animals, fungi, and water. As the climate changes, the risk also increases for health threats such as: Anaplasmosis. Anthrax.