The WHO and CDC ramped up diagnostic testing for Bundibugyo Ebola as the outbreak in the DRC escalated in spread risk. WHO raised the threat level from High to Very High after assessing the likelihood of nationwide expansion. CDC’s incident manager Satish Pillai described how early testing missed the less common Bundibugyo species, prompting additional testing and sequencing at CDC-supported government labs in Kinshasa once new specimens arrived. Response teams—including disease detectives and viral hemorrhagic fever experts—are being deployed alongside epidemiology and community healthcare worker training efforts.