by NIH/National Institute of Allergy and Infectious Diseases Colorized scanning electron micrograph of chronically infected and partially lysed cells (green) infected with a variant strain of SARS-CoV-2 virus particles (blue), isolated from a patient sample. Image captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. Credit: NIAID A booster dose of the mRNA-1273...