The 18 Americans, who returned to the U.S. early Monday following a deadly outbreak of hantavirus on a cruise ship, are quarantined and in “good shape,” public health officials have said. One of the 18 Americans has tested positive for the rodent-borne virus which originated on the MV Hondius ocean expedition vessel last month, killing three passengers and infecting eight others. More than 140 passengers and crew disembarked in the Spanish Canary Islands Sunday, where the Americans were met by the U.S. Centers for Disease Control and Protection. The Department of Health and Human Services said Monday that 16 passengers are in isolation in a specialist quarantine unit at the University of Nebraska Medical Center, including the positive patient. They do not have symptoms and are under observation. Two others are being monitored at Emory University Hospital in Atlanta, Georgia, due to lack of space in Nebraska, officials said.…