Public health officials , meanwhile , are also identifying people who have had close personal contact with the newly diagnosed patient and will follow up with them for 21 days , the longest known incubation period for Ebola . CDC reports : African health system has been preparing since 2014 for first confirmed Ebola case . Clear difference between Ebola in Africa and what will happen in U.S. , says Tom Frieden . 21 months is the longest known incubation period for Ebola , Frieden says .
CDC reports : African health system has been preparing since 2014 for first confirmed Ebola case . Clear difference between Ebola in Africa and what will happen in U.S. , says Tom Frieden . 21 months is the longest known incubation period for Ebola , Frieden says .