The New York doctor who became infected with Ebola while treating patients in Guinea has been upgraded from serious to a stable condition, according to hospital officials.

Dr. Craig Spencer, the only confirmed case of Ebola in New York, has been undergoing treatment at Bellevue hospital for nine days when he first had symptoms of a high temperature and stomach pains. He has been receiving treatment therapies that proved effective in treating the Dallas nurse that was isolated at Emory University Hospital in Atlanta and the journalist at the Nebraska Medical Center. The treatment therapies include include plasma infusions with Ebola-fighting antibodies and experimental drugs.

Concerns about Dr. Spencer's movements prior to his treatment at Bellevue prompted the governors of New York and New Jersey to declare a mandatory quarantine for people exploded to Ebola in West Africa. Since then, quarantines have been introduced in Florida, Georgia and Illinois.

A woman in Oregon, who traveled to an Ebola-affected country, has been placed in isolation at a hospital outside of Portland on Friday after registering a sustained high temperature of 102 degrees, according to state health officials. It has not been confirmed the woman has Ebola.

"The patient does have an acute illness of some kind," Dr. Paul Lewis, Tri-Country health officer, told reporters. "Ebola is on a list of possibilities."

Health officials said she is not a danger to the public, and two people living in the same house as the patient are under a voluntary quarantine, according to KGW an NBC affiliate in Oregon.

The Pentagon said Friday that civilian U.S. defense employees returning from Ebola relief work in West Africa will undergo monitoring but can chose between civil health guidelines or the military regime of 21-days quarantine.

Top medical experts say the public should expect more cases to emerge in the United States before year's end as infected people, including doctors and nurses, arrive in the U.S. from the three Ebola-stricken countries -- Guinea, Liberia and Sierra Leone.