RE: Advice from CDC in US27 May 2021 10:06
Er you’re all completely forgetting that before anyone had ever heard of COVID - all over the world theatre staff, surgeons, dental surgeons, orthodontists, dentists, doctors for medical procedures etc etc have to wear a medical surgical grade TYPE 11R mask! Geez - if you remember guys all the way back last year their focus was this and industry, - some factories in normal times require workers to wear masks for sterile production conditions eg food or technology production lines.
IMHO DYOR GLA