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yukondave 4 points ago +4 / -0

The WHO reported their views on masks in 2019, using data from randomised controlled trials (RCTs) – the gold standard.

‘Ten RCTs were included in the meta-analysis, and there was no evidence that facemasks are effective in reducing transmission of laboratory-confirmed influenza.’

https://apps.who.int/iris/bitstream/handle/10665/329438/9789241516839-eng.pdf?ua=1

Since then, there has only been one RCT done on COVID19 transmission, in Denmark. It did not find any significant benefit from masks in reducing spread.

https://pubmed.ncbi.nlm.nih.gov/33205991/