A professor of medicine in San Francisco has revealed he intends to wear a face mask to protect against in crowded spaces for the rest of his life, describing his decision as 'taking reasonable steps to avoid infection'.Dr. Bob Wachter, the chair of medicine at the University of , San Francisco (UCSF), spelt out the steps he was taking in a lengthy thread.Wachter told his 275,000 followers that - but was concerned about the potential of Long COVID.
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