Lyme disease infects a minimum of 300,000 people per year in the United States and millions more throughout the rest of the world. Symptoms run from mild lethargy to severe arthritis to heart disease to incapacitating mental dysfunction. Although tests have improved over the past decade, they are still not completely reliable, and antibiotics are only partially effective. Up to thirty-five percent of those infected will not respond to antibiotic treatment or will relapse. The spirochetes that cause Lyme are stealth pathogens--they can hide within cells or alter their form so that our...