Some health workers in Liberia had stopped using the protective gear that was part of the Ebola routine. The photo above is from 2014, when the epidemic was at its peak. David P. Gilkey/NPR hide caption

toggle caption David P. Gilkey/NPR

Police officers take positions as they arrive at scene of a bus explosion in the center of Tunis, the capital city of Tunisia, Tuesday. Hassene Dridi/AP hide caption

toggle caption Hassene Dridi/AP