Fig 1 Virus genome data from EBOV cases in Sierra Leone characterizes the spatial spread of the epidemic. (A) The time course is shown for the number of confirmed cases24 and sequenced EBOV genomes22. Three stages of the epidemic are highlighted. (B) Genetic linkages are illustrated with ancestors (open circles) and descendants (closed dots), both colored by the origin district shown in map key. The blue arrow highlights a linkage from the W. Urban to Kenema districts. (C) Chiefdom populations (grayscale) and major roads (yellow traces) are illustrated on the map of Sierra Leone. The blue arrow highlights the fastest driving route between the W. Urban to Kenema district.