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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.
There was little/no evidence for the efficacy of masks when lockdown started. It's still debated now. In fact, the WHO recommended only people with symptoms wear them to start, and that they were not necessary for those without.