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Masks are not worn during surgery to stop a virus:
https://en.m.wikipedia.org/wiki/Surgical_mask#Healthcare_workers
A surgical mask is intended to be worn by health professionals during surgery and certain health care procedures to catch microorganisms shed in liquid droplets and aerosols from the wearer's mouth and nose.
The difference between microorganisms and virus:
https://www.gohealthuc.com/library/what’s-difference-between-viruses-and-bacteria
-Bacteria are single-celled microorganisms that can live and reproduce on their own. Viruses are much smaller particles that require a host cell in order to survive and replicate. Only 1% of bacteria that exist in the world is harmful to humans._
OK, but I’ll continue to wear mine in crowds if that’s OK.