Twelve staffers at a hospital in the Netherlands are under quarantine after treating a hantavirus patient, Dutch Health Minister Sophie Hermans told lawmakers.

“Strict procedures were followed there, but not the very strictest procedures that apply in the case of this hantavirus,” Hermans said.

“This concerns the taking of blood and the disposal of urine from the patient,” she said. "… The chance that staff were infected as a result is small, but because we know that we are dealing with a serious virus here, [the hospital officials] said we are erring on the side of caution. We know this is a drastic measure with a major impact, but we are taking it nonetheless.”

-ABC News’ Othon Leyva

Jake Rosmarin is among the passengers quarantining in Nebraska after disembarking the MV Hondius cruise ship.

"I was relieved to get off the ship and have a plan in place, and they were treating us really, really well here, so I can't ask for anything more than that," Rosmarin told ABC News’ “Good Morning America” on Tuesday.

Rosmarin said he is not experiencing any symptoms and plans on remaining in quarantine for the next 42 days.

"I think that is the best decision that's for me and for my family, and I know that here, I'm in the best care possible," Rosmarin said, adding that his room in the quarantine unit has air conditioning, an exercise bike and he is receiving at least three meals a day. "I can't ask for any more than that."

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Dr. Tedros Adhanom Ghebreyesus, Director-General of the World Health Organization, stressed on Tuesday that “there is no sign that we're seeing the start of a larger outbreak.”

He said the process of offloading passengers from the cruise ship was successful and he opened up about the mental struggles those on board were facing.

“Almost 150 people from 23 countries were on this ship for weeks, in what must have been a very frightening situation. Even some of the passengers were facing mental breakdown,” he said at a news conference.

“There were some people around the world calling for the passengers to be contained on the ship for the full quarantine period. Our view was that it would have been inhumane and unnecessary,” he said.

The director-general said that of the 11 reported cases, all are among the ship’s passengers and crew.

“There have been no deaths since May 2, when WHO was first informed of the cluster of cases,” he said. “All suspected and confirmed cases have been isolated and managed under strict medical supervision, minimizing any risk of further transmission.”

-ABC News’ Othon Leyva

Twelve U.S. residents are under monitoring by state health departments for hantavirus, according to officials. None of these 12 people have symptoms, officials said.

Seven of the 12 were cruise ship passengers who disembarked before the outbreak was declared: two are in Texas, two are in Georgia, one is in Virginia, one is in Arizona and one is in California.

The other five people were exposed to an infected individual during air travel, officials said. Two are in New Jersey, two are in Maryland and one is in California, officials said.

-ABC News’ Youri Benadjaoud

The French cruise ship passenger who tested positive for hantavirus “is presenting a severe form and is currently in intensive care in a serious condition,” French Health Minister Stephanie Rist said in French at a news conference on Tuesday.

She "has the most severe form of cardiopulmonary presentation, and she is receiving what is called, or rather what is the final stage of supportive care: extracorporeal circulation for artificial oxygenation," Risk said. "She has a lung-machine, a blood diversion, which we hope will allow her to get through this difficult period while her lung, which is being attacked by this virus and the damage to the vascular wall, recovers."

The other four French nationals who were taken off the ship were hospitalized for monitoring and they tested negative and "are doing well," she said.

Rist stressed that only people who were on the ship have tested positive.

Through contact tracing, Rist said “eight French nationals were identified on the flight between Saint Helena and Johannesburg. A second flight between Johannesburg and Amsterdam was carrying French nationals with a lower level of risk, in so far as a patient was present but was rapidly disembarked, which limited the exposure of travelers.”

“In total, 22 contact cases have been identified in France,” she said. “They have all been contacted, tested, hospitalized or are in the process of being hospitalized and are subject to rigorous health monitoring.”

-ABC News’ Othon Leyva