Lyme disease is a tick-borne infectious disease that, if left untreated, can affect the joints, heart and nervous system, according to the Centers for Disease Control and Prevention. -------------------------------------- Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/