Severe malaria is the likely cause of dozens of unexplained deaths and nearly 600 illnesses in the Democratic Republic of Congo, health officials believe.

DAKAR, Senegal — 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, health ...

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.