Patient Zero, a two-year-old boy dies a few days after falling ill in a village in Guéckédou, a village in southeastern Guinea that borders Sierra Leone and Liberia. A week later, the virus kils the boy’s mother, then his three-year-old sister, then his grandmother. All have symptoms of the virus, including fever, vomiting and diarrhea, but at the time, no one knew what had made them ill. Two mourners at the grandmother’s funeral take the virus home to their village. A health worker carries it to another village, where he dies, as does his doctor. They both infect relatives from other towns. WHO releases the chart of infection in August 2014.