Flies carry disease by transporting infectious agents on their feet. They may spread salmonellosis, typhoid, and other diseases. (Image courtesy of the Centers for Disease Control and Prevention.)
Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.