Mayo Clinic Radio: Vector-bourne diseases

Illnesses caused by disease-infected ticks, mosquitoes and fleas have tripled in the U.S. in recent years, according to a report from the Centers for Disease Control and Prevention (CDC). Lyme disease is the most common vector-borne illness in the U. S. According to the CDC, about 30,000 cases of Lyme disease are reported each year, but the number of unreported cases is estimated to be 10 times that amount. You may wonder, if Lyme disease has become so common, why isn’t there a vaccine for it?