PLOS  Current Outbreaks  by Nadia Wauquier and others                                             April 20, 2015

The initial steps of emergence and spread of a virus are critical in the development of a potential outbreak and need to be thoroughly dissected and understood in order to improve on preventative strategies. In the current West African outbreak of EVD, a unique index case has been identified, pinpointing the geographical origin of the epidemic in Guinea.

Herein, we provide an accounting of events that serve as the footprint of EVD emergence in Sierra Leone and a road map for risk mitigation fueled by lessons learned....

...Continuous active surveillance is needed and must be organized by specialized centers joined in local, regional, and international networks. Surveillance centers must be connected to public health systems and also to research teams for increased understanding and awareness to permit identification and implementation of rapid intervention strategies....

Read complete study  and see maps.

http://currents.plos.org/outbreaks/article/understanding-the-emergence-of-ebola-virus-disease-in-sierra-leone-stalking-the-virus-in-the-threatening-wake-of-emergence/