It's already the second-largest outbreak in history, only behind the 2014-16 West Africa outbreak that recorded more than 28,000 cases including over 11,000 deaths. The Ebola outbreak is unlike most previous ones because the rare Bundibugyo virus responsible for it has no approved vaccines or treatments. Many health workers have gone on strike to protest lack of payment for their work since the outbreak was declared. The ongoing outbreak has had a case fatality rate of 45.9 per cent, more than the 39.6 per cent rate recorded in the 2014-16 West Africa outbreak. The first Ebola virus to be identified was in 1976 near the Ebola River in what is now Congo.