Hantavirus live updates: 41 people under monitoring across US

There are 41 people under monitoring across the U.S. for potential hantavirus infections, the Centers for Disease Control and Prevention's incident manager for hantavirus, Dr. David Fitter, said in a phone call with reporters.

Those 41 people include: 16 people who were repatriated from the cruise ship and are under quarantine at a Nebraska facility; two who were repatriated from the cruise ship and are being monitored at an Atlanta facility; seven people who were former cruise ship passengers who left before the outbreak was declared; and 16 people who were exposed during travel, including on flights, officials said.

No Americans are positive for hantavirus at this time, officials said.

All 16 people in the Nebraska facility are recommended to stay for the entire 42-day period, officials said.

The remaining exposed people who are not at the quarantine facilities are recommended to stay at home, away from others, with an emphasis to avoid travel, officials said. These individuals are in touch with their state and local health departments and the CDC said it is in touch with those departments.

North Dakota's health department said it is monitoring five individuals who were exposed to a sick hantavirus cruise ship member abroad. None of these five people were on the cruise ship, the department said.

There are now 11 state health departments monitoring a total of at least 23 people, none of whom have symptoms.

The other states monitoring people are Texas, California, Georgia, Virginia, Arizona, New Jersey, Maryland, Washington, Kansas and Minnesota.

Three people in Kansas who have been under monitoring by the state's health department for potential hantavirus infection have been transported to a hospital for observation, a department spokesperson told ABC News.

It is not clear why they were transported and if any of the three have shown signs of symptoms.

Kansas' health department initially announced on Tuesday that these three people -- who were not cruise ship passengers -- were exposed to an infected individual abroad. The department said their exposure was "high risk" and said at the time that they were not showing any signs of illness.

Dr. Stephen Kornfeld, who identified himself as the first American who initially tested positive for hantavirus from samples taken on the cruise ship, has now tested negative in subsequent testing, he told ABC News.

The testing was originally listed as inconclusive per the World Health Organization because of a positive and negative test result returned from a Dutch lab. Health officials had proceeded with caution and labeled him as a positive case.

Kornfeld was moved from the Nebraska Biocontainment Unit to the National Quarantine Unit, alongside his fellow passengers, according to a statement from Nebraska Medicine.