Hantavirus in the US: Where the rare, sometimes deadly disease has been found

As investigations continue into the hantavirus outbreak that originated on the expedition cruise ship MV Hondius, concerns swirl about the prevalence of the virus in the U.S.

Among passengers of the ship, which was traveling from Argentina across the Atlantic, there have been three deaths and at least eight reported cases, several of them laboratory-confirmed, according to the World Health Organization and subsequent health reports.

At least five states are now monitoring residents who returned from the MV Hondius...