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@robertwills

Maybe I didn't explain my question in the right way. Try this: If my friend doesn't take sensible precautions to reduce their risk of catching viruses in public does that put me at risk from catching the all viruses from my friend? Or only the ones that I would have contracted if I were exposed?

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Replies to "Maybe I didn't explain my question in the right way. Try this: If my friend doesn't..."

Being immunocompromised means they can more easily get sick when exposed to germs, not that they are a reservoir for a lot of different harmful bacteria and/or viruses. If your friend is sick and within the window for being infectious to others (testing positive for covid, for example) then it is possible for others to catch that particular disease from them. There are rare instances of people being carriers, Typhoid Mary being a case in point, but most people can share colds/flu/etc. only when they are sick. https://www.cdc.gov/respiratory-viruses/risk-factors/weakened-immune-systems.html#:~:text=When%20Sick,a%20respiratory%20virus%20to%20others.