I grew this from a mask that was worn for two hours by a group of students that thought mask policies were stupid. Masks crate the perfect environment for pathogens to grow-warm, dark and moist! This is what you are breathing all day. It’s concentrated in front of your airway!😬 https://t.co/HxME1PK9no pic.twitter.com/nk6m1G0rOb

— Kerry O RN.MBA 🐭 (@KerryOLeary4) May 25, 2023