The pair first optioned Richard Preston's 1992 New Yorker article "Crisis in the Hot Zone," before it was turned into a best-selling book. As the disease continues to ravage West Africa, killing upwards of 4,500 people, Obst felt it was the time to set the project in motion.
“I think it's the speed with which it kills that makes the disease so frightening,” she tells The Hollywood Reporter. “People hoped it would stay in some remote part of the world. But that's a fantasy in the modern world. The modern world makes us one big connected family.”