How Lyme disease spreads to infect millions of Americans

Ticks and the diseases they carry are being helped by a warmer climate, as well as more trees, deer and people. Lyme disease is the most common vector-borne disease carried by ticks, and experts say it's here to stay.
Published: 2:07 PM EDT August 19, 2019
Updated: 1:52 PM EDT August 19, 2019