From the article: "On November 14, Lesotho public health authorities conducted a simulation exercise involving a woman who was rushed to hospital and tested positive for Ebola after crossing the border from South Africa. Media picked up on this event and reported it as if it were true. But a few hours later it was revealed that there had been no Ebola case in Lesotho, and this event was only a drill. The Lesotho government was conducting a public health simulation exercise. When done properly, a simulation exercise is a useful tool for evaluating preparedness for a public health emergency. When done poorly, a simulation exercise can cause unnecessary panic in local or international communities. Here, we’ve drawn on our experience in Liberia to outline how to properly plan and execute a simulation exercise."