This handout image obtained on April 29, 2020 and released by the National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health (NIH), shows a colorized scanning electron micrograph of an apoptotic cell (red) heavily infected with SARS-COV-2 virus particles (yellow), isolated from a patient sample captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. (Photo by Handout / National Institute of Allergy and Infectious Diseases / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES, NIH " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS