Plague Fleas. That's what you need. Rats are much more susceptible to plague than humans, and, unlike with poison, die out in the open. If you can infect one rat with one flea, it will infect the rest of the tribe.
'Course, you'll want to vacate the area while it works itself out....
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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