HALLANDALE BEACH, Fla. – The quarantine of Gulfstream Barn 3 will remain in effect until mid-March, even though there is no apparent danger to horses stabled there. Track officials said a horse who recently tested positive for equine infectious anemia, or swamp fever, has been shipped off the premises to a private farm in nearby Davie. All remaining horses have tested negative for the disease, but a 45-day quarantine is mandated by the Florida Department of Agriculture.