A total of 18 passengers from the cruise ship hit by a hantavirus outbreak

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arrived at the University of Nebraska Medical Center (UNMC) in Omaha for quarantine, but a couple was transported to Emory University in Atlanta after one partner developed symptoms, officials said.

Another passenger had previously tested PCR-positive for the virus, and while remaining asymptomatic, was moved to UNMC's biocontainment unit for monitoring.

The other 15 passengers are in UNMC's quarantine unit, where they all remain asymptomatic, officials said during a UNMC press briefing on Monday morning. They will continue to be assessed before any decisions are made about their next steps.