a close up of a green and white substance

Methicillin-Resistant Staphylococcus aureus (MRSA) Bacteria Scanning electron micrograph of methicillin-resistant Staphylococcus aureus (MRSA) bacteria (colorized green) interacting with a human neutrophil. The bacteria shown is strain MRSA252, a leading cause of hospital-associated infections in the U.S. and U.K. Image captured at NIAID's Rocky Mountain Laboratories (RML) in Hamilton, Montana. Credit: NIAID https://www.flickr.com/photos/niaid/53362598585/