Our daughter Natalie was 11 years old when it happened. In New England, where we live, there is an epidemic of ticks that carry the bacterial spirochete Borrelia burgdorferi, which causes Lyme disease. Recent estimates suggest that approximately 300,000 people in the United States may contract the disease each year. Left untreated, Borrelia hides out in skin cells and lymph nodes, causing facial paralysis, heart problems, nerve pain, memory loss, and arthritis. It hides in a protective biofilm, making it extremely difficult to kill.