"It is certainly possible that someone who had contact with this individual...could develop Ebola in the coming weeks," Frieden said, but added that "there is n

"It is certainly possible that someone who had contact with this individual...could develop Ebola in the coming weeks," Frieden said, but added that "there is no doubt in my mind that we will stop it here," Frieden said. General rule of thumb: Anytime someone says "there is no doubt in my mind about X", you can be pretty sure that yeah, they do have a lot of doubt in their mind about X.