Mysterious illness dubbed 'Disease X' spreading rapidly, has killed mostly children, infected over 400. Check symptoms

A mysterious illness, dubbed disease X, has killed at least 31 people — mostly children — in the remote Panzi region of the Democratic Republic of Congo, the World Health Organization says. The actual number of deaths in the region is difficult to determine, and some reports say as many as 143 people have died. The WHO said rapid response teams have been sent to identify the cause of the outbreak of Disease X and help coordinate a suitable response.