The Collaborative International Dictionary of English v.0.48:

Quarantine \Quar`an*tine"\, v. t. [imp. & p. p. Quarantined;
   p. pr. & vb. n. Quarantining.]
   To compel to remain at a distance, or in a given place,
   without intercourse, when suspected of having contagious
   disease; to put under, or in, quarantine.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quarantined
    adj 1: under forced isolation especially for health reasons; "a
           quarantined animal"; "isolated patients" [syn:
           isolated, quarantined]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "quarantined":
   apart, barred, beleaguered, beset, besieged, blockaded, bound,
   cabined, caged, cloistered, closed-in, confined, cooped, cordoned,
   cordoned off, corralled, cramped, cribbed, detached, enclosed,
   fenced, hedged, hemmed, immured, imprisoned, in a backwater,
   incarcerated, insular, isolated, jailed, leaguered, mewed,
   out-of-the-way, out-of-the-world, paled, penned, pent-up, railed,
   remote, removed, restrained, retired, roped off, sealed off,
   secluded, segregated, separate, separated, shut off, shut-in,
   unfrequented, unvisited, walled, walled-in, withdrawn