ABUJA: The World Health Organization declared Sunday the Ebola disease outbreak in Congo and Uganda a public health emergency of international concern.

Africa’s top public health body first confirmed a new Ebola outbreak in Congo’s Ituri province on Friday. By Saturday, it had reported 336 suspected cases and 88 deaths. All the cases are in Congo, except for two recorded in neighboring Uganda.

Health authorities say the current outbreak is caused by the Bundibugyo virus, a rare variant of the Ebola disease that has no approved therapeutics or vaccines, making it much harder to fight.

Although more than 20 Ebola outbreaks have taken place in Congo and Uganda, including 17 in Congo since the disease first emerged in the country in 1976, this is only the third time the Bundibugyo virus has been reported.

Here’s what to know about the health crisis: