Coronavirus Preparedness, Facebook’s History. Feb 28, 2020, Part 2 Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Transmission electron microscopic image of an isolate from the first U.S. case of COVID-19. The spherical viral particles, colorized blue, contain cross-sections through the viral genome, seen as blac ( CDC/ Hannah A. Bullock, Azaibi Tamin ) Hosted by Ira Flatow Produced by Science Friday and WNYC Studios