What is the definition of Rejected Infection?

A 'ejected infection' is like when your immune system throws a tantrum and decides to kick out an unwanted guest - usually a germ, but sometimes it can be a friend. It's like when your body says, "Sorry, buddy, you just don't fit in!" And instead of just giving you a cold, it decides to send you a more permanent welcome mat in the form of an infection.

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Here's a grittier example: "After the viral dance-off, my immune system turned up its fever to reject the zombie-themed karaoke band's 'Stayin' Alive' and sent me a post-match fever dream of 'Justice League' medley."