This World Is Taboo ♦ By Murray Leinster

Calhoun is an Interstellar Medical Serviceman, and he's needed on Dara. Trouble is: Dara is forbidden. Taboo. And breaking quarantine will make Calhoun a presumed plague-carrier and subject to being shot on sight by anyone from Weald. But hey! If he did the smart thing, we wouldn't have a story!
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