Authorities say the mystery disease in Congo might be malaria but more testing is needed The Associated PressWhy the Mysterious 'Disease X' Outbreak Is So Hard to Investigate Scientific AmericanUnraveling the Mystery in the DRC’s Disease Outbreak—Is It Disease X? The New York Academy of SciencesMysterious illness, dubbed "disease X," has killed dozens of people in Congo, WHO says CBS NewsEU Commission adopts wait-and-see approach with mystery Congo virus Euronews