The CDC is closely monitoring an "unknown disease” that has killed dozens in the Democratic Republic of Congo, the agency said in a statement on Monday.

Symptoms of the illness include fever, vomiting, and internal bleeding, with most patients dying within 48 hours of onset.

Is a new virus causing a disease outbreak and deaths in the Democratic Republic of Congo, or is the cause already known to science?

Reports of a large number of unexplained illnesses and deaths in Equateur province have garnered international attention, likely in part because this region of DRC has had several Ebola outbreaks in recent years.