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This 2020 electron microscope image made available by the U.S. Centers for Disease Control and Prevention shows the spherical particles of the new coronavirus, colorized blue, from the first U.S. case of COVID-19. AP-Hannah A. Bullock, Azaibi Tamin/CDC via AP/The Canadian Press
The virus that causes COVID-19 can be spread sometimes through airborne particles in enclosed spaces with inadequate ventilation, the Centers for Disease Control and Prevention (CDC) said in updated guidance on Oct. 5.