The World Health Organization declared an international public health emergency as the Ebola death toll in the Democratic Republic of Congo and Uganda surpassed one hundred.The outbreak stems from the rare Bundibugyo virus, which initially escaped detection because laboratory tests misidentified the pathogen as a more common strain.Authorities reported nearly four hundred cases while the US Centers for Disease Control and Prevention issued a Level Four travel advisory to curb further spread.Frontline medical personnel remain at high risk after an American doctor was confirmed infected while treating patients in the affected region.