U.S. health officials are monitoring 16 additional people across the country for symptoms of hantavirus whom the Centers for Disease Control and Prevention has not previously mentioned, the agency said on Thursday. The new people the C.D.C. reported were not on the cruise ship but were passengers on an April 25 flight to Johannesburg and exposed to someone known to have been infected, said Dr. David Fitter, who is leading the C.D.C.’s response to the outbreak. The new total of those being monitored in the United States is 41, a significant increase over the 18 passengers from the Dutch cruise ship who were brought back to the United States on Monday. They are quarantining at special facilities in Omaha and Atlanta.

Full report : 16 More People in the U.S. Are Being Monitored for Hantavirus, C.D.C. Says.