Maybe they are getting it from the packages and mail that is delivered to their homes. I pick up my mail with tongs and put it aside for 4 or 5 days before opening it. And when I do open, I clean my hands with 91% alcohol immediately.
I do pretty much the same, even though the odds of contracting anything from regular mail are extremely low (actually, never heard of it happening).
Packages are another thing, especially if people are getting a lot crap from some China hellhole. I’d put that stuff in the garage for a month. I don’t order anything from China itself.