21 March 2008
Vol 319, Issue 5870

About The Cover

Cover image expansion

COVER Clusters of the pathogenic bacterium Staphylococcus aureus visualized by scanning electron microscopy. Staphylococcus aureus has been called a "superbug" because of its ability to resist numerous antibiotics and evade host antimicrobial mediators, including nitric oxide. See page 1672.

Image: Annie Cavanagh/Wellcome Images