A man in western Congo died Thursday with hemorrhagic fever symptoms, leading officials to suspect that a still-unidentified virus may be involved alongside malaria in a mysterious outbreak that has killed dozens of people,

A mystery illness found in a remote part of Congo has been officially identified as a severe form of malaria, which has sickened nearly 600 people and killed 143.

A previously unknown disease that has claimed the lives of dozens in the Democratic Republic of Congo is likely to be malaria, the African Union's health watchdog said Thursday.