90-Second Read: Map shows which states are monitoring for Hantavirus cases in the US

The strain at the center of the outbreak has been confirmed as the Andes virus, which is believed to spread person-to-person, according to the World Health Organization. Officials in twelve states are monitoring Hantavirus exposures or possible infections as of May 13. Of the Americans, it's unclear which states they all reside in, but some state officials have said they have residents among the 18 quarantining in Nebraska or Georgia.

The American passengers on board the MV Hondius ship did not return stateside until after evacuating on May 10. The majority of the American passengers are now quarantining in Nebraska where they will be monitored for symptoms. Two were sent to Atlanta for further assessment, officials said.

Hantavirus is a virus usually transmitted to people through contact with rodents' urine, feces or saliva. The map below shows where potentially impacted people are quarantining or being monitored. Here's the breakdown of what we know so far: This story has been updated with new information.