Update, June 24, 2020: Since communities in the United States resume holding public events such as protests and political rallies, the Centers for Disease Control and Prevention has released new guidelines defining these sorts of gatherings as high risk. In situations where maintaining physical distance is difficult, the CDC says cloth face coverings are “most essential” and should be worn by both event staff and attendees.
Update, May 6, 2020: As stay-at-home orders come to an end and businesses across the U.S. begin to re-open, a number of states are taking the CDC’s recommendation to wear a cloth face-covering in public to the next level by making it a requirement. This is in effect in the following seven states so far: New York, New Jersey, Connecticut, Pennsylvania, Maryland, Rhode Island, and Hawaii.
Update, April 4, 2020: The CDC issued a recommendation that President Donald Trump shared on Friday: