New government data reveals the number of Lyme disease cases in the United States may be about 10 times higher than previously reported. According to the Centers for Disease Control and Prevention, as many as 300,000 people are diagnosed with Lyme disease each year, while only about 30,000 cases are reported to the agency. A recent study in the journal Science linked the loss of biodiversity from human-impacted climate change to the increased spread of Lyme disease and other infectious illnesses.