CDC director Dr. Tom Frieden: More U.S. cases of Ebola "not impossible"

DALLAS, Oct. 1 (UPI) -- Although the director for the Center of Disease Control assured Americans the agency will swiftly nullify any threat of the Ebola virus spreading stateside, until they do, the CDC admits more U.S. infections are "not impossible."

For now, CDC Director Dr. Tom Frieden has a seven-person team monitoring the staff attending to and the family of the first person diagnosed with Ebola in U.S.

"Contact tracing is intensive. We have a seven-person team in Dallas working with the local health department and the hospital, and we will be identifying everyone who may have come in contact with him and then monitoring them for 21 days," Frieden told ABC News.

"What we need to do first in this particular instance is do everything possible to help this individual who's really fighting for their life, and then make sure that we're doing that, that we don't have other people exposed in the hospital, identify all those contacts and monitor them for 21 days. It's not impossible that one or two of them would develop symptoms and then they would need to be isolated."

Although many more individuals were exposed to the unidentified patient as he flew from Africa back to Texas with a layover in Europe, Frieden says those people are not at risk as, although the patient was infected at that time, he was not contagious.

"That was four or five days before he had his first symptoms and with Ebola, you're not contagious until you have symptoms."