I tend to disagree with you somewhat on masks - based on nuclear and military training. I do agree that most masks (and especially in the way many people use them) are pretty useless. No mask or respirator will filter everything, but they can be pretty effective if used correctly, and a lot of that comes down to proper fit - no beards and no gaps. When I thought more and read more, there's an issue a lot of anti mask people don't take into account. Airborne viruses transferred from person to person are attached to droplets of varying size and are expelled differently - simple breathing vs a sneeze, for example. And it's more complex because with evaporation the droplet size becomes smaller - but generally you are still looking at something much larger than the virus itself. One part of CBR training is to ensure that when you demask and take off other protective clothing it's done so that you keep contaminants away from you - yet people drop the mask right below the nose and inhale anything attached to a mask. Also there's been very little mention about eyes - without at least glasses there's a perfectly good surface for airborne particulates to adhere to, and a pathway directly to the nasal passages.
My first thoughts were that a lot of the transmission paths could be modeled like we do in nuclear applications with three dimensional and time variant calculus, but the truth is that it's more complex. In a nuclear fission event, dispersed neutrons are generally pretty well described in mass and energy, but vapor droplets from an infected person are very different - very different energy and mass. Some travel faster, some travel further, and some may be small enough not to be filtered, but you still have to consider that N95 masks also rely on electrostatic charge to trap the smaller particles. The point is that medical science seems to be well behind the curve; they apparently have a lot of work to do, or at least they haven't done well in getting information out. As I recall at the start, they didn't even assume that covid was an airborne infection - mind boggling. Most of our accumulated mask data are basically worthless because there has been no standard (everything from scarves to respirators), certainly no real training in use and removal after exposure, and no talk about eye protection; I don't think you can draw any conclusions at all from how we've handled personal protective gear in a covid environment.
I don’t wear a mask in public. Around here you can enter several businesses and they don’t say a word. Wash your hands, don’t go out of you are symptomatic and protect the compromised.
As for my hospital, we were required to wear eyewear with side protectors for patient facing encounters. Has not stopped several people getting sprayed in the forehead and it dripping down. So we went to totally occlusive eyewear or face shield.
I wear a n-100 which they recently tried to outlaw because of the exhaust vent. They were concerned that if we had any other respiratory illness we would spread that to covid pts. So, I put n-95 disc in the exhaust vent. They can’t get past my work around.
In the beginning they were repurposing masks. They tried several different methods to reuse n-95
and surgical masks. After several attempts including a high vapor residual rinse and side effects that were untenable like burning eyes, Severe rhinitis and breathing difficulties. The supply from China finally caught up and we were able to use new masks and not repurposed masks. I got sick of having rhinitis constantly from the surgical masks, so I wash my surgical masks and change my n-100 filters every month. I no longer have issues with my nose. Whatever they use to permeate the surgical masks causes constant irritation to my co-workers and myself.
There are donning and doffing procedures in place including the wipe down area for your N100, goggles, shield outside every droplet plus room. Most covid rooms are positive pressure and allow escape of anything aerosolizing in the room like hi flow nasal cannula, non rebreathers and bipap on positive pts. Vented pts are on a closed circuit with no outside aerosolizing. We wear surgical masks in common areas and non covid rooms.
My point of contention with infection control with every hospital has been positive pressure room usage, doffing in common areas outside the room ( there is no anteroom which is required for infection control ). We have sliding doors with gaps in them allowing free airflow out of room. Common areas are affected with that airflow continually. So we have staff that wear an N95 with a surgical mask over the top of it. It can get very uncomfortable after 12 hours. We have had 3 workers get ill, one was covid positive and the other 2 negative with respiratory and cold symptoms. The covid pos is already back to work. She’s 72.
There was a solution used by one hospital in Richmond. They put strong air intake unit in every room and vented it via hepa filter to the outside. Yes, they cut into their windows. It essentially turned it into a negative pressure room. Expensive for 18 rooms but effective. You could feel the vacuum going into the room.
So when I say I’ve been bathing in covid for 2 years I’m being honest. This is the case with most hospitals employees who are hands on and on a covid unit.
Sidenote:
Hope you are doing ok after your valve replacement. By your posts the only danger was the wifes driving.
