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Here’s an interview with a, if not the, leading infectious disease expert in South Korea. The whole video is worthwhile, but go to 17:40 if you want the exact moment. Also note his statement of ‘During the SARS and MERS outbreaks, masks were proven to work.’
https://m.youtube.com/watch?v=gAk7aX5hksU
If this isn’t your field, then you could be excused for not being aware of the above interview, published 27 March 2020. The people calling the shots in government have no excuse, it’s literally their job to have found this information out, if one believes that they did not already know.
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I haven't heard a single person claim it was their use of face masks.
In South Korea, an aggressive ‘trace, test and treat’ programme was put in place. Members of the public were advised to avoid large gatherings and crowded places, and to follow quarantine protocols, such as wearing a face mask, handwashing and social distancing. Among these, wearing a face mask is considered to be one of the most effective preventive measures. According to a recent article, 63.2% of Koreans reported wearing a face mask when they are outside
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7291980/
now you have
There was the entirety of the effective South Korean response a few months prior...?
One of the biggest letdowns (of many) for me this year has been the WHO bowing to Chinese and US political pressures, instead of fulfilling its role as the global reference for medical treatment and advice. It was clear early on that masks were effective at preventing spread. It is also clear that the refusal to recommend or mandate them was because certain countries didn’t have enough stock for their healthcare workers.Fact is, even making homemade face coverings mandatory would have saved hundreds if not thousands if not tens of thousands of lives.
Why people continue to debate this is beyond me.