VIDEO-Ebola Outbreak | FRONTLINE | PBS

Filming in Sierra Leone was “like being in a war zone where the enemy is invisible,” said FRONTLINE’s Wael Dabbous, who spent two weeks on the ground as the outbreak spiraled out of control.

In 2009, FRONTLINE/World investigated how a novel idea in public health, called “One Health,” has emerged to help combat threats like Ebola, Marburg virus and TB.