Dr. Kent Brantly, who was infected with Ebola in West Africa, was flown back to the United States and being treated at Emory University in Atlanta where the CDC said his condition "seems to be improving."

Brantly was being treated in a special isolation unit at the university hospital. His case makes it the first time anyone with Ebola has been brought in the country, reported USA Today.

“It's encouraging that he seems to be improving. That's really important, and we're hoping he'll continue to improve,” said Tom Frieden.

Frieden, the director of the Atlanta-based Centers for Disease Control, also said the doctor’s children visited the doctor in Liberia. They were not suspected to be at risk, reported the AFP.

“It doesn't spread casually and it doesn't spread from someone who's not sick,” Frieden said.

Brantly's wife and kids visited him while he was in Liberia, but was not suspected to have contracted the virus. Frieden said that they visited him "when he was not sick."

Brantly was one of two American aid workers who contracted Ebola while treating the outbreak in Liberia. Nancy Writebol, the second American infected, will arrive in the United States in the week.

More than 1,300 West Africans were infected with the disease, which has killed 729 people.