Colorized transmission electron micrograph of Vero E6 Cells in culture infected with Yellow Fever Virus particles found within distended regions of the endoplasmic reticulum. 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.