By Richard P. Leach, MD, Special to The Chronicle
The question of how to use face masks in the current COVID-19 pandemic has been discussed quite a lot in recent weeks. The advice of experts has gone back-and-forth, confusingly. Things are starting to be a bit clearer now.
First it should be said that the virus that causes COVID-19, called SARS-CoV-2, is flung from an infected person’s throat into the …
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