Conflicting recommendations exist related to whether masks have a protective effect on the spread of respiratory viruses.The Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement was consulted to report this systematic ...
www.ncbi.nlm.nih.gov
There's your link. General efficacy established.
That’s just the usual rag tag collection of studies of different kinds of masks, in different settings, across different diseases, with desperate contortions being performed to show little to no benefit. The conclusion you’ve posted above includes the sentence:
“More evidences are still needed to better clarify the effectiveness of masking in various circumstances.”
What strikes me is that the body of evidence(s
) that exists now is exactly the same as it was pre Covid. Up until a few weeks ago the overwhelming scientific consensus, based on that evidence, was that there was no overall benefit to masks/face coverings being worn outside clinical settings.
What has changed since then? In scientific terms, absolutely nothing. COVID has come along, and resulted in political pressure in favour of masking up. The WHO has admitted that its position was changed due to political lobbying rather than a change in the science etc.
In short, the available science is now being twisted to suit a changing political narrative. That doesn’t sound particularly “scientific” to me.
The most useful piece of PPE for me in this pandemic so far has been a set of noise cancelling headphones. That way, when someone in a pink hi vi asks me where my mask is, I can’t hear them!