I feel entitlement-vibes

Efficacy at WHAT? Protecting the wearer? Or protecting other people?

Part of the see-sawing in the UK was the belief by the medical profession that CoVid wasn't air-born - as a result of a half-remembered TB study from a century before, that explicitly said its conclusions were specific to TB and should NOT be used for anything else.

And the above WHAT question - masks do not protect the wearer! But the evidence that they help prevent an infected person from spreading it is apparently quite strong. If you're infected, you shouldn't go out. But if do go out you should wear a mask. Not for your sake, but for other peoples'. And the face shields apparently, while a very good comforter, are pure ineffective placebo at both tasks.

Cheers,
Wol