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The word quarantine comes from quarantena, meaning "forty days", used in the 14th–15th-centuries Venetian language and designating the period that all ships were required to be isolated before passengers and crew could go ashore during the Black Death plague epidemic; it followed the trentino, or thirty-day isolation period, first imposed in 1347 in the Republic of Ragusa, Dalmatia (modern Dubrovnik in Croatia).
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