What does a mask do? Blocks respiratory droplets coming from your mouth and throat.
Two simple demos:
First, I sneezed, sang, talked & coughed toward an agar culture plate with or without a mask. Bacteria colonies show where droplets landed. A mask blocks virtually all of them.
We had Snehith, 3rd Year Medical Student studying @UCLan, on the night shift last night. He was keen to practice some clinical skills and he managed his first successful cannula 💉💪. Well done! #MedTwitter #ClincialSkills