90-Second Read: Quarantine ends for all 18 Americans exposed to Hantavirus on cruise ship

Quarantine has ended for the 18 Americans who were cruise ship passengers on the MV Hondius and were exposed to Hantavirus more than one month ago. What parents should know about talking to kids about Hantavirus As of May 27, there have been a total of 13 cases of Hantavirus -- 11 confirmed and two probable -- and three deaths, of which two have been confirmed, according to the WHO. The working hypothesis behind the cluster is that the first case acquired Hantavirus while on land, before boarding the cruise ship, the WHO said.

The 42-day monitoring period ended on June 21 and "no sustained transmission" of the virus has been identified in the U.S., a spokesperson for the Department of Health and Human Services (HHS) told ABC News. Six of the 18 passengers spent their entire quarantine period at the National Quarantine Unit (NQU) in Nebraska while others left on a case-by-case basis over the past few weeks depending on whether their state provided adequate public health mitigation efforts. The World Health Organization (WHO) said it received notification on May 2 of a cluster of "severe acute respiratory illness" aboard the MV Hondius, including two deaths and one critically ill passenger.

All cases have been passengers or crew members on the ship. The 11 confirmed cases tested positive for Andes virus, a rare strain of Hantavirus, and the only one that is known to transmit between people, according to the Centers for Disease Control and Prevention. The 42-day period ended on June 21, according to the HHS.