Live from ABC News headquarters in New York City.

This is Good Morning America.

We're going to begin with that breaking news overnight.

One American evacuated from the cruise ship

in the Canary Islands testing positive for hanta virus,

while another is showing mild symptoms as a plane carrying them

and 16 others arrived back here in the U.S. overnight.

The CDC says they'll be monitored and assessed at the National Quarantine Unit in Omaha, Nebraska.

Victor Okendo is on the ground there with the latest for us. Good morning to you, Victor.

Good morning, Robin. We are just outside of the National Quarantine Unit here in Omaha.

This is described as a world-class quarantine and isolation facility.

Those Americans and one British national arriving here less than an hour ago after days of uncertainty on board that ship.

Overnight, at least one American testing positive for Haanta virus and another showing

mild symptoms while onboard their repatriation flight, according to the Department of Health

and Human Services.

Officials say the two were traveling in the plane's biocontainment units out of an abundance

of caution.

All 17 Americans and one British national who live in

America returned home. The plane landing around 4 a.m. in Omaha, Nebraska. The passengers

de-planning one at a time, taken straight to the National Quarantine Center at the University

of Nebraska to be evaluated. The American who tested for the

Andi strain of the virus is being treated by the university's biocontainment unit. The CDC initially

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