health officials on Friday encouraged more Americans to wear the kind of N95 or KN95 masks used by health-care workers to slow the spread of the coronavirus.

In updated guidance posted late Friday afternoon, CDC officials removed concerns related to supply shortages and more clearly said that properly fitted N95 and KN95 masks offer the most protection.

However, agency officials noted some masks are harder to tolerate than others, and urged people to choose good-fitting masks that they will wear consistently.