Fig 1. Ebola risk level of African countries based on history of outbreaks.

Countries at highest risk (red) of a future Ebola outbreak were identified as those affected by at least one documented outbreak since 1976. Moderate-risk countries (orange) are those with borders contiguous to high risk countries, and low-risk countries (yellow) are those with no history of Ebola cases and without shared borders with high risk countries. Health care worker (HCW) estimates were derived from the most recent available World Bank estimates of numbers of physicians, nurses, and midwives (per 1,000 population) and the 2014 population in each country.