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The Centers for Disease Control in the US has issued an alarming prediction - the number of Ebola cases could be as high as 1.4 million by January. How did they reach this conclusion? Anthony Reuben is head of statistics for Â鶹Éç News.

(Photo: A resident sick from the Ebola virus waits outside a treatment centre in Sierra Leone. Credit should read ZOOM DOSSO/AFP/Getty Images)