(CNN) -- The fear began just after news broke Thursday that a long-range business jet with an isolation pod left the United States for Liberia, where it will evacuate two Americans infected with Ebola.
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While U.S. officials have remained mum on the issue, a source told CNN that a medical charter flight left from Cartersville, Georgia, on Thursday evening.
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It was not immediately known when the two Americans -- identified by the source as Dr. Kent Brantly and Nancy Writebol -- would arrive in the United States, or where the plane would land.
At least one of the two will be taken to a hospital at Emory University, near the headquarters of the U.S. Centers for Disease Control and Prevention in Atlanta, hospital officials told CNN's Dr. Sanjay Gupta.
The patient will be cared for in an isolation unit at the hospital that is separate from patient areas, Gupta said.
With the return of Brantly and Writebol to the United States, it will be the first time that patients diagnosed with Ebola will be known to be in the country.
Brantly and Writebol are described as being in stable-but-grave conditions, with both reportedly taking a turn for the worse overnight, according to statements released Thursday by the faith-based charity Samaritan's Purse.
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The Ebola outbreak is believed to be the worst in history, and even in a best-case scenario, it could take three to six months to stem the epidemic in West Africa, Dr. Thomas Frieden, director of the CDC, told reporters on Thursday.
Writebol gets 'experimental serum'
Both Brantly, a 33-year-old who last lived in Texas, and Writebol were caring for Ebola patients in Liberia.
An experimental serum was administered to Writebol this week. Only one dose of the serum was available, and Brantly asked that it be given to his colleague, said Franklin Graham, president of Samaritan's Purse.
Samaritan's Purse said it did not have any additional detail about the serum.
At the same time, Brantly received a unit of blood from a 14-year-old boy who survived Ebola, the statement said. Brantly had treated the teen, it said.
It was not immediately clear what doctors hoped the blood transfusion would do for Brantly.
While blood transfusions have been tried before, Frieden told reporters no one really knows why some people survive and some don't.
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Rate of infection
The rate of infection has slowed in Guinea, but it has increased in neighboring Sierra Leone and Liberia.
As infection accelerates, some aid groups are pulling out to protect their own.
Samaritan's Purse and the missionary group Serving in Mission have recalled all nonessential personnel from Liberia.
The Peace Corps announced Wednesday it is doing the same, removing its 340 volunteers from the three severely affected nations.
While there are no confirmed cases, a Peace Corps spokeswoman said two volunteers came into contact with someone who ended up dying from the virus.
Those Americans haven't shown signs of Ebola but are being isolated just in case. The spokeswoman said they can't return home until they get medical clearance.
Meanwhile, Liberian President Ellen Johnson Sirleaf and Sierra Leone's President Ernest Koroma both canceled trips to the United States, and Koroma declared a state of emergency. Koroma announced an action plan to tear down many barriers that international medical workers say they face while fighting disease.
Sirleaf said on CNN's "The Lead with Jake Tapper" that the country is in desperate need of people with expertise in treating and dealing with Ebola.
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Koroma said he will deploy police and military to accompany the aid workers.
They will search house to house for the infirm and enforce orders designed to curb the virus' spread.
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Nigeria's Minister of Health Onyebuchi Chukwu says the government is still searching for more people that had contact with Sawyer on his journey on a plane that stopped in Accra, Ghana and Lome, Togo, before traveling on to Lagos.
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