Have you noticed that you see so many pictures of people wearing face masks during the 1918-20 influenza pandemic, but you dont for people with tuberculosis (TB)in the same era? There is a story here about a controversy that I think makes the one over evidence in the Covid-19 #masks4all debate easier to understand. It starts with a sanitary engineer, his protoge medical student, and a landmark study in Baltimore published in 1959.
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