The outbreak has sickened at least 1,600 people in five states.
The outbreak was reported to the CDC on Thursday, during the cruise ship's April 28 to May 11 voyage.
Six U.S. states are tracking nine residents for possible hantavirus infections.
Spanish authorities on Friday were preparing to receive more than 140 passengers and crew members on board a hantavirus-stricken cruise ship headed for the Canary Islands.
More than two dozen people from at least 12 different countries left a cruise ship hit by a deadly hantavirus outbreak without contact tracing, officials say
The ship at the center of a deadly outbreak departed Cape Verde with nearly 150 people on board and headed to Spain's Canary Islands.