Many thanks to Henrik, who just left a comment on the Le Monde post. He wrote:
My daughter is a doctor in Foya, Liberia, close to the border to Guinea. They have had one confirmed ebola death. Also, the disease is reported in Monrovia.
I haven't found any Liberian media covering the story yet, and Guinea's own ministry of health website appears to be down. But I'll look further into the Liberian angle.