Justin Timberlake announced he's been battling Lyme disease, a debilitating infectious disease typically transmitted through a tick bite. Tick populations and bites are at their highest levels in over five years,

This undated provided by the U.S. Centers for Disease Control and Prevention shows a blacklegged tick, also known as a deer tick, a carrier of Lyme disease. Justin Timberlake announced this week that he's been diagnosed with Lyme disease.