What they've said in public seems to make some sense.
They don't think masks are useful in preventing people from getting the virus. They are, however, of potential use to prevent people from spreading it. Previously they didn't think this was needed, because everyone assumed that you'd know if you had it, and stay home.
But they've been finding increasing evidence that non-symptomatic people are spreading it. So it now looks useful for everyone to wear a mask so that if they have it without knowing it, they won't spread it.
They don't think masks are useful in preventing people from getting the virus. They are, however, of potential use to prevent people from spreading it. Previously they didn't think this was needed, because everyone assumed that you'd know if you had it, and stay home.
But they've been finding increasing evidence that non-symptomatic people are spreading it. So it now looks useful for everyone to wear a mask so that if they have it without knowing it, they won't spread it.
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