A previous version of this article was based on expert guidance at the time of publication, but as the COVID-19 pandemic has grown in the U.S. in recent weeks, public health thinking around wearing face masks has changed. On March 30, the U.S. Centers for Disease Control and Prevention announced it was reviewing its guidelines for face masks, citing data showing that COVID-19 can be spread by people who are infected but not exhibiting symptoms. Then, on April 3, President Donald Trump announced that the CDC is changing its guidance to include a recommendation that all Americans wear non-medical masks, or fabric that covers a person’s face and nose, when they leave their house.
More Must-Read Stories From TIME
- Meet TIME’s Newest Class of Next Generation Leaders
- After Visiting Both Ends of the Earth, I Realized How Much Trouble We’re In
- Google Is Making It Easier to Remove Personal Info From Search
- Oil Companies Posted Huge Profits. Here’s Where The Cash Will Go (Hint: Not Climate)
- Column: We Asked Hundreds of Americans About Abortion. Their Feelings Were Complicated
- A Short History of the Rise, Fall, and Rise Again of the Marcos Family
- Long-Lasting Birth Control Is Already Hard to Get. Advocates Worry It May Only Get Worse
- Who Should Be on the 2022 TIME100? Vote Now
Read More From TIME