’Superbugs’ that strike the sickest patients

In hospitals' war against drug-resistant superbugs, gram-negative bacteria is emerging as a deadly threat to the sickest and most vulnerable patients. The scourge of what was once thought to be a fairly benign class of bacteria is throwing a new wrench into efforts to contain the spread of deadly infections. While they don't cause disease in healthy people, infections by gram-negative bacteria can be devastating for those with weak immune systems.