Federal health officials on Sunday lifted the quarantine for U.S. passengers aboard a cruise ship hit by a deadly hantavirus outbreak.

All 18 passengers have been release – 12 who had been in home confinement and six who had been held for weeks at a federal facility in Nebraska, according to The New York Times, 

The six stayed at the National Quarantine Unit at the University of Nebraska Medical Center until the end of the 42-day period. Since the end of May, 12 had been released from the unit to home confinement.

There had been, as of Thursday, no confirmed case of the virus in the U.S. associated with the cruise outbreak, the U.S. Centers for Disease Control and Prevention said in an update.

The outbreak occurred on the cruise ship the MV Hondius that began its route in Argentina in April. The European Center for Disease Prevention and Control said that 13 cases of hantavirus had as of June 17 been reported from the ship. Three passengers died, The Times also reports.