Cover your mouth and nose with a cloth face cover when around others
You could spread COVID-19 to others even if you do not feel sick.
The cloth face cover is meant to protect other people in case you are infected.
Everyone should wear a cloth face cover in public settings and when around people who dont live in your household, especially when other social distancing measures are difficult to maintain.
Maybe because "most" of the studies cited in the paper you linked to "were underpowered because of limited sample size, and some studies also reported suboptimal adherence in the face mask group", and maybe there are better, more recent studies showing their effectiveness?
"Based on the best evidence available at the time, it was not deemed that that would have a significant impact on whether or not a healthy person wearing a mask would contract COVID-19," [U.S. Surgeon General Dr. Jerome] Adams said.
However, as more knowledge about the virus has come to light, it became apparent that asymptomatic people could be spreading the virus. Up to 25% of people with COVID-19 may not show symptoms, the CDC found. Moreover, a new small study found that COVID-19 may be most infectious when symptoms are mildest, meaning that people may be spreading the virus before realizing they have it.
"This means that the virus can spread between people interacting in close proximity for example, speaking, coughing or sneezing even if those people are not exhibiting symptoms," the CDC said in a news statement today. "In light of this new evidence, CDC recommends wearing cloth face coverings in public settings where other social distancing measures are difficult to maintain."
Under the new recommendation, healthy individuals are advised to wear mouth and nose face coverings including homemade masks, scarves or bandanas when they go to a public area, such as the grocery store or a pharmacy.