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.

"If you've experienced this disease or know someone who has — then you're aware: living with this can be relentlessly debilitating, both mentally and physically," Timberlake wrote. "When I first got the diagnosis I was shocked for sure.