Hantavirus live updates: American who initially tested positive now tests negative

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.

-ABC News’ Youri Benadjaoud

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.

-ABC News' Youri Benadjaoud and Vera Drymon

Officials with the U.S. Centers or Disease Control and Preventionupdated the public on the hantavirus situation and reiterated the risk to the U.S. population remains low.

Dr. David Fitter, the incident manager for CDC’s hantavirus response, told reporters in a telephone news conference that the agency has over 100 staff working full time on the outbreak.

Dr. Brendan Jackson, the CDC team lead in Nebraska where some of the U.S. passengers of the MV Hondius are quarantining, said that the one passenger who tested positive did his tests abroad but they were inconclusive.

"We got a positive and a negative abroad, so we want to redo the test here in the U.S.," he said.

The CDC is awaiting the results of that new test, Jackson said.

-ABC News' Eric Strauss

Jake Rosmarin, one of the American cruise patients currently quarantining in Nebraska, provided an update on his Instagram page Wednesday.

On his third day of quarantine at the National Quarantine Unit, Rosmarin showed off his thermometer used to take his temperature, his breakfast and his daily routine.

"One thing I really want to emphasize is how kind everyone here has been. The staff truly want to make sure we are as comfortable and cared for as possible during all of this. They even asked me what Starbucks I’d want and said they were hopefully going to get one delivered to me again today," he wrote in the post.

-ABC News' Matt Foster