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Viruses also can stay inactive in the body for years, see herpes as an obvious example. No idea if that can also be true for flu viruses though.

True for herpesviruses as they infect the immune system, but rhinovirus and coronavirus don't reactivate.

And chickenpox infects the nervous system.

Chickenpox is a herpesvirus too, although very different symptoms to "common cold".

That’s true, but I felt the need to call out the nervous system component of the picture.