Someone mentioned the US Navy having Hospital ships to house these quarateened people. That I know they have only 2 and I do not know the status of them. You can read about them here http://www.navalorder.org/articles/2016/8/28/an-overview-of-hospital-ships

Most of the WW2 Hospital ships were AH- and were US Army Hospital (AH) ships piloted by US NAVY crews. I had a few family members serve on board these ships in WW2.
AH-6 USS Comfort was decommissioned is used as a training ship.
AH-7 USS Hope was scrapped in 1978.
AH-8 USS Mercy was scrapped in 1970.