Seventeen Americans evacuated from an infected cruise ship fly back now.
They will be monitored at the only federal quarantine center in Omaha.
Risk of widespread hantavirus contagion remains extremely low, officials confirm.
American passengers disembarked after weeks aboard the M/V Hondius ship.
CDC agents interview passengers about their exposure and health status.
Some may return home for self-isolation after the assessment in Nebraska.
Learn more about the hantavirus outbreak and its implications.