The US government is struggling to deal with the deadly virus, with some people dying while others have died of their symptoms.
The latest news comes as the US prepares to send some of its citizens home to be treated at hospitals across the country.
US officials have said they expect to have at least 10,000 Americans home by the end of the week.
“We are trying to make sure that as we have the numbers come in that we have enough people that can be treated, so that the health care system can begin to stabilize and to get the people that are most vulnerable back into the community and able to start taking care of their families,” Dr. Tom Frieden, director of the Centers for Disease Control and Prevention, said on Thursday.
“That’s our goal, and it will be achieved.”
Some people have died while others were hospitalized, and officials say they are worried about the spread of the virus.
Frieden also said that while he has no information on whether any Americans have contracted the virus from Ebola in the United States, he expects that there will be an uptick in cases in the coming days.
People are still dying, and this is happening in this country in ways that are completely beyond our control, he said.
“It is absolutely a concern,” Frieden added.
He said there is no clear timetable for when the country will have full control of the outbreak, but he said that the CDC has made efforts to ensure that those people who are not being tested are not getting sick from the virus as the outbreak has grown.
More than 7,800 people have been killed in the outbreak.
The CDC has also reported that more than 10,700 Americans have tested positive for the virus, while 3,200 others have been tested and are now free of symptoms.
According to the CDC, more than 17,000 people have tested negative for the disease, and the virus is now in its fourth week in the country, with about 7,600 confirmed cases and more than 3,000 probable cases.
At least 1,700 people have contracted Ebola in Africa.
Some of those who have contracted it are now in isolation at a facility in Guinea.