I have a serious question though. Let's say a person is wearing a m95 mask and is protected significantly from the virus. He walks into a room that has a covid positive person in it. The covid positive person coughs or sneezes in the proximity of the person wearing the mask. The droplets land on parts of his face, neck and forehead. Afterwards, the person leaves the room and takes off his mask. Could the droplets that landed on his face, neck, and forehead eventually be inhaled after they dry?
Short answer is, possibly, but there's not a lot of evidence for that with coronavirus or rhinovirus. Instead of being merely in the proximity, the person sprays you in the face with a cough or sneeze, where you feel the wetness, A), hope you're wearing glasses (or googles or a face shield) and B), you should probably wash your face soonest. The evidence
seems to show (key word is
seems) that when the droplets from the cough or sneeze that landed on your skin has enough mucous left behind that it acts like sort of a glue that keeps the virus where it landed, and by the time the mucous breaks down to where you might inhale the virus, it's either dead or in such a small quantity as to not matter.
If you pick up coronavirus on your hands from another surface, and then touch your face, it can shed almost immediately (unless you have a greasy, oily face) to where you can inhale it. That's a bigger concern. Of course, if you touch your eyes, nose or mouth with tainted fingers, it's an immediate path into your mucous membranes and your lungs.
Most of the news coverage has been about transmission through large water droplets, coughs and sneezes, but we've known for decades that respiratory viruses like coronavirus and rhinovirus can spread through just normal talking and breathing. So it's more a matter of proximity and time. We don't know the minimum COVID-19 dose you need to become infected, but we know that dose matters, and the bigger the dose the worse it is, with smaller doses not resulting in infection. It's not like some viruses where all it takes is just one of them little buggers to get you (TB, Typhoid, Ebola, etc.). WIth coronavirus it takes hundreds of thousands, or millions. We just don't know how many.
The key to not getting it isn't to isolate yourself in a Bio Level 4 HAZMAT suit all the time, but rather to constantly mitigate and reduce dose exposure.
I've spent a lot of time in doctor's offices over the last few weeks, and 2 doctors and at least 3 nurses have all said the same things: they aren't concerned with the virus on the skin, clothing or hair, but are more concerned about keeping their hands clean so as to not transfer the virus to their eyes, nose or mouth. And they wear a mask and keep proximity and time to a minimum when dealing with patients who have tested positive.
Whenever I take off my N95 mask, I give it a shot of Lysol. It won't disinfect it, not completely, but it will reduce the amount of virus on there. Every little bit helps.
Incidentally, from the
CDC: "Among 139 clients exposed to two symptomatic hair stylists with confirmed COVID-19 while both the stylists and the clients wore face masks, [15-45 minutes spent with each client,] no symptomatic secondary cases were reported; among 67 clients tested for SARS-CoV-2, all test results were negative." Not a scientific controlled study, but worth noting.