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Our mailman wears disposable gloves. Also the mail is sitting for maybe 24 hours or more before it gets delivered so I think that is probably enough time for any virus to dissipate.
The virus is transmitted primarily by respiration, not hands. While you are personally comfortable with your mailman's germs (I understand that you live someplace where CoVid is rare), the topic isn't just about each one of us and our individual habits. If I lived someplace where the positivity rate was 27% (it's 6% where I live), I would think about mail more.
So I'm typing this out in hopes it will make people in those places either step up their game or feel comfortable with what they're doing.
If someone mails me something here in town (such as legal documents), it's typically 12 hours between leaving that place and arriving at my door. How much CoVid has to be on the mail before it could be infectious?
Most mail goes through conveyor belts. How often are they sanitized? I just asked our post office about it (by phone) and the answer was "we are not sanitizing the conveyor belts." I asked about the storage bins - they aren't sanitizing those either. They are short-handed right now and there is no mandate.
So while I believe mail is not a usual source of infection, the fact that people who say they are "doing everything" and have never left their house are getting CoVid is an interest of mine.
The virus lasts on surfaces like conveyor belts for "hours to days" according to the research. Average is 24 hours for a carton and conveyor belts could be reinfected continuously (so hard to study and no one has attempted it, AFAIK - just one study saying 72 hours for a conveyor belt in a closed system).
The virus doesn't "dissipate." It deactivates after a time (different in varying circumstances). It can still be located even if deactivated. Where would it "dissipate" to, I wonder? It's a physical object. The amount of virus found on floors and in sewer water is very large - and is still active for up to a week (no one knows).
At any rate, very little new research on this topic and the early studies were provisional.
One form of the virus lives on paper for up to 5 days - so we can each decide for ourselves. But I'd sure wonder about that particular vector for the "I've never left my house, all groceries sit for 24 hours before I touch them" group. I'd also wonder if people's handwashing actions (most people wet their hands before adding soap) are a factor (inadvertent droplets splashed onto the face?)
Another possible source of CoVid for the "I have no idea where I got it" group is sink drains, traps, shower floors and traps. The study on this is new. We wash our hands in sinks, CoVid is found in the sink's plumbing. Is further water going down the drain capable of creating aerosols? I'm reading some conversations among some lab researchers who are arguing about how to go about recreating this situation in order to study it (different forces of faucet water have to be emulated, etc)
The new more stable form of CoVid (the "G" mutation) lasts longer than the prior version on these surfaces. Still waiting for any sort of coherent research to be done on just how long the more stable form lasts.
100,000 virions exhaled per breath in an active shedder who isn't talking...probably 1 million needed for most people to get infected. No one has estimated the "hand to face" transmission vector (and some scientists think it is super rare - but maybe that's what happens with these also super rare cases of people locked into their homes - and still getting CoVid?)
As someone else said, there has to be some way these people are getting it.