Abstract
<bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">After initial assertions</b> that the wearing of face masks was an unnecessary public health tool in the prevention of the spread of Covid-19, the advice coming out of the Centers for Disease Control (CDC) suddenly changed. In early April, the CDC issued new guidelines advising people to wear face coverings in public settings where social distancing is difficult.
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