Cruise Ship Hantavirus Outbreak
Andes virus detected on ship, rarely transmissible between humans.
World Health Organization warned new cases possible due to 42-day incubation.
Spain's Health Ministry reported a passenger positive in Madrid during quarantine.
Multiple countries monitoring with daily health checks.
18 American passengers in Nebraska and Georgia under observation, some in biocontainment.
Ship to Rotterdam for cleaning after repatriating over 20 countries' passengers, 27 crew arrive May 17.
5 hours ago