90-Second Read: 18 Americans quarantining after Hantavirus outbreak: What we know

At least 18 people are under strict monitoring in the U.S. after disembarking the MV Hondius, the cruise ship at the center of a deadly Hantavirus outbreak. The other is symptomatic but has not tested positive for Hantavirus, according to federal health officials. Public health officials are closely monitoring their residents who were potentially exposed to Hantavirus but weren't notified until after they went home.

The patient who tested positive for Hantavirus is in Nebraska's biocontainment unit. At least seven Americans who left the ship earlier than this weekend's overnight evacuation in the Canary Islands have returned to states including Georgia, California, Arizona, Virginia and Texas. Possible exposures include two people who were aboard the ship but returned home and are "being monitored by their local public health officials," according to the California Department of Public Health.

Maryland's Department of Health also confirmed it is monitoring two residents who were on a flight that briefly included a passenger from the MV Hondius. This Hantavirus, the andes virus, is the only strain that is person-to-person. The Andes strain of the virus killed three people aboard the ship, and dozens more passengers and crew remain on board, according to Spanish authorities.