Colorized scanning electron micrograph of Middle East Respiratory Syndrome (MERS) virus particles (yellow) attached to the surface of an infected VERO E6 cell (blue). The image was captured and color-enhanced at the National Institute of Allergy and Infectious Diseases (NIAID) Integrated Research Facility in Fort Detrick, Maryland (USA); image retrieved via Flickr and modified by MIC. The cover is published under the Creative Commons Attribution (CC BY) license.