「人口全員がFFP2/N95マスクを着用すると、COVID-19感染の有効再生産数が約9分の1に減少します」
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Harry Spoelstra
@HarrySpoelstra
"If a population all wear FFP2/N95 masks, this reduces the effective reproduction number for COVID-19 transmission by a factor of approximately 9."
That's......f.cking substantial!
#CovidIsNotOver #MaskWork nature.com/articles/d41581
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