Contents

01 August 2014
Vol 345, Issue 6196

About The Cover

Cover image expansion

COVER Colorized scanning electron micrograph of a dog roundworm (Toxocara canis). Intestinal parasites infect more than 1 billion people worldwide and cause serious morbidity, particularly in the developing world. In mice, intestinal parasites also dampen their host's immunity to viruses, causing latent viruses to reactivate and impeding antiviral defenses. See pages 517, 573, and 578.
Image: © Eye of Science/Science Source