Lyme disease is an acute inflammatory disease characterized by skin changes, joint inflammation and symptoms similar to the flu that is caused by the bacterium Borrelia burgdorferi. Lyme disease is transmitted by the bite of a deer tick. Symptoms sometimes improve in 3 to 4 weeks, but secondary or tertiary disease may develop if initial infection is not treated.
Review Date 7/13/2020
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.