She added that the doctor felt her neck and rechecked the temperature. “ ‘There’s no way you have a fever,’ he said. ‘Your face is just flushed.’ ”

Image Kaci Hickox. Credit... Kara Hickox

Her complaints served as a broadside against the new quarantine policy, which goes further than recommendations from the Centers for Disease Control and Prevention. The new policy has raised concerns among some health experts and doctors that it will discourage people from going to West Africa to try to contain Ebola at its source. The World Health Organization reported on Saturday that there were more than 10,000 suspected or confirmed cases in the three hardest-hit countries.

The C.D.C. calls for self-monitoring for travelers who have had contact with Ebola patients, but not for isolation, because a patient is not believed to be contagious until symptoms appear. But C.D.C. officials said that states had the right to go beyond their recommendations.

On Saturday, in a sign of growing concern about the virus, Gov. Pat Quinn of Illinois, the home of O’Hare International Airport in Chicago, began a quarantine program similar to the one in place in New York and New Jersey. Connecticut, which enacted a similar policy on Oct. 7, has quarantined nine people who have so far showed no symptoms.

White House officials held a meeting on Saturday to discuss whether to revise nationwide policies regarding the return of health care workers from affected West African countries. An official said the administration may take further action, although it wanted to avoid anything that would hinder the ability to fight Ebola in West Africa.

On Friday, the day after a New York City doctor who had worked in Guinea through Doctors Without Borders tested positive for Ebola, the governors of New York and New Jersey described the quarantines as a necessary caution. Some of the details of where travelers would be quarantined, whether at their homes or elsewhere, were still being worked out Saturday.

Asked about the nurse’s essay while visiting Iowa, Gov. Chris Christie of New Jersey said, “My heart goes out to her because she’s someone who has been trying to help others and is obviously ill,” referring to earlier reports of a fever.