A new retrospective, laboratory-based observational study provides detailed insights into the causes of fevers of unknown origin in sub-Saharan Africa. Together with scientists from Guinea and Slovakia, researchers from the German Center for Infection Research (DZIF) at Charité – Universitätsmedizin Berlin examined 550 patients from Guinea who developed a persistent fever at the time of the major Ebola outbreak in 2014, but tested negative for the Ebola virus on site. The goal was to use modern diagnostic methods to better understand the underlying infectious diseases. The study is published today in The Journal of Infectious Diseases.