As of May 12, nine confirmed and two suspected cases of hantavirus infection have been associated with a cruise aboard the Dutch-flagged MV Hondius, according to the World Health Organization.
The ship departed Argentina on its current voyage April 1. Three people have died.
Fifteen American citizens and one British national have been taken to a quarantine facility in Nebraska, where they will be assessed for symptoms and exposure risk.
Two people have been transported to Emory University's Serious Communicable Diseases Unit in Atlanta.
Additionally, several dozen people disembarked the ship on St. Helena on April 24. These passengers include seven Americans, who are now being monitored across five states.