This is an adult female deer tick. Ixodes dammini. . It transmits Lyme disease and babesiosis to humans. (Image courtesy of the Centers for Disease Control and Prevention. Update Date: 05/19/2008Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.