The chief of the World Health Organization said Tuesday he is “deeply concerned about the scale and speed” of the Ebola outbreak in the Democratic Republic of Congo (DRC) and Uganda, as local officials warn of a rising death toll linked to the epidemic.

Some 88 people have died from the highly contagious haemorrhagic fever in the DR Congo, with one death in Uganda, and at least 336 suspected cases.

With a rising number of cases, at least 80 suspected deaths and no approved vaccine, fears are mounting.