What is the definition of Returned Infection?

A 'eturned infection' is like when your immune system, after taking on the bad guy (a germ or virus), decides to bring them back for another play. It's like when you get a nasty case of the flu, and then a few months later, you're back to square one, sweating bullets (or maybe just shivers), battling that same pesky virus as if it's the new game night.

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Here's an unsettling example sentence: "After a decade-long battle, the once-invincible superhero of colds, now back with a vengeance in the form of a chronic sinus infection, decided to make a triumphant return, leaving the world of viral villains in stitches."