Pokerus

A horrible disease in the Pokemon games, probably the only cool sickness ever. Pokerus spreads incredibly easy and fast and it can go from one Pokemon to all Pokemon in your party. Also makes them twice as strong.

Pokerus is the best contagious illness ever!
Man, I wish my Squirtle was sick. It's acting like a bastard.
Why isn't there a Humanrus?

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