Unlike a cold or the flu, Ebola cannot be transmitted before symptoms show upCDC director: All passengers boarding from Ebola hotspots are screened for feverCNN reporter: Customs officers had very different responses to a crew's return from Liberia(CNN) -- For the first time, a patient in an American hospital has been diagnosed with Ebola.The unidentified man, who is being treated at a Dallas hospital, didn't show symptoms until after four or five...