ical ▁and ▁practical ▁consider ations ▁need ▁to ▁be ▁considered ▁when ▁applying ▁quar antine ▁to ▁people . ▁Pract ice ▁diff ers ▁from ▁country ▁to ▁country . ▁In ▁some ▁countries , ▁quar antine ▁is ▁just ▁one ▁of ▁many ▁measures ▁govern ed ▁by ▁legisl ation ▁rel ating ▁to ▁the ▁bro ader ▁concept ▁of ▁bio security ; ▁for ▁example ▁Australian ▁bio security ▁is ▁govern ed ▁by ▁the ▁single ▁over arch ing ▁Bio security ▁Act ▁ 2 0 1 5 . ▁ ▁Et ym ology ▁and ▁termin ology ▁ ▁The ▁word ▁quar antine ▁comes ▁from ▁quar ant ena , ▁meaning ▁" fort y ▁days ", ▁used ▁in ▁the ▁ 1 4 th – 1 5 th - cent uries ▁Ven et ian ▁language ▁and ▁design ating ▁the ▁period ▁that ▁all ▁ships ▁were ▁required ▁to ▁be ▁isolated ▁before ▁passengers ▁and ▁crew ▁could ▁go ▁ash ore ▁during ▁the ▁Black ▁Death ▁pl ague ▁ep ide mic ; ▁it ▁followed ▁the ▁tr ent ino , ▁or ▁thirty - day ▁isol ation ▁period , ▁first ▁im posed ▁in ▁ 1 3 7 7 ▁in ▁the ▁Republic ▁of ▁R ag usa , ▁Dal mat ia ▁( mod ern ▁Dub rov nik ▁in ▁Cro atia ). ▁▁ ▁Mer ri am - Web ster ▁gives ▁various ▁mean ings ▁to ▁the ▁n oun ▁form , ▁including ▁" a ▁period ▁of ▁ 4 0 ▁days ", ▁several ▁rel ating ▁to ▁ships , ▁" a ▁state ▁of ▁enfor ced ▁isol ation ", ▁and ▁as ▁" a ▁restriction ▁on ▁the ▁movement ▁of ▁people ▁and ▁goods ▁which ▁is ▁intended ▁to ▁prevent