An Ebola outbreak centered in eastern Democratic Republic of the Congo has surpassed 100 confirmed deaths as cases continue to rise faster than response efforts. Key facts - Official tallies: about 550 confirmed cases and 101 confirmed deaths (CDC report cited June 7). News outlets report at least 100 deaths less than a month after the outbreak was declared. - Modeling by U.S. health officials warns that, without much stronger isolation of infectious people and improved public‑health measures, the outbreak could grow to 20,000 cases or more. - The virus circulating is the Bundibugyo strain, which has a reported fatality rate of roughly 30–50%; there is currently no approved vaccine specifically for this strain. Why the outbreak is expanding - Response capacity is lagging behind transmission. Public‑health experts say vaccines alone will not stop spread unless combined with robust surveillance, rapid contact tracing, safe patient isolation and sustained community engagement. - Community resistance and insecurity are complicating interventions: incidents reported include the burning of an Ebola treatment facility in Mongbwalu, confrontations around burial practices and reports of police firing warning shots. Vaccine and preparedness efforts - Multiple groups are racing to develop and test vaccines. Some candidates could begin human testing within two to three months, while more advanced candidates might take up to nine months to reach trials. - Regional and international agencies have begun coordinated planning: the Africa CDC and WHO launched a joint continental preparedness and response plan to support affected countries. Bottom line The outbreak has crossed the 100‑death threshold and is outpacing current response capacity. Experts and modelers say urgent strengthening of surveillance, contact tracing, isolation and community engagement — alongside accelerated vaccine development — will be needed to prevent much larger spread.