The Ebola outbreak in Central Africa has potential to escalate significantly, reaching 20,000 cases or even more. This estimate hinges on the speed at which infected individuals are isolated. The Centers for Disease Control and Prevention (CDC) released computer model scenarios on Friday. These scenarios predict a range from 10,000 to beyond 20,000 cases. If these projections are realized, this outbreak could rival the previous worst Ebola outbreak in West Africa from 2014 to 2016, which accounted for over 28,000 reported cases and over 11,000 deaths.
Dr. Satish Pillai, incident manager for the CDC’s Ebola response, emphasized the need for robust public health interventions to prevent an outbreak of this scale during a briefing with reporters. Jennifer Nuzzo, director of Brown University’s Pandemic Center, noted the outbreak’s alarming trajectory and warned against relying on specific numerical forecasts due to data limitations. As of Friday, the Africa Centres for Disease Control and Prevention reported approximately 400 confirmed cases, including 63 deaths. Unreported cases are also suspected.
Ebola spreads through direct contact with bodily fluids such as vomit, blood, and semen. No specific treatments or vaccines are available for the Bundibugyo virus, which is the current outbreak’s cause. The World Health Organization declared the outbreak a global health emergency in May. Early reports suggest infections may have started in February, but initial tests targeted a different Ebola virus strain.
Conflict in the region complicates response efforts. An armed struggle between Congo’s government and the M23 rebel group, backed by Rwanda, along with attacks by the Islamic State-affiliated Allied Democratic Force, has led to massive displacement. Nuzzo earlier noted a low risk to the United States, and CDC confirmed this assessment. U.S. government measures, such as entry bans for non-U.S. passport holders who visited Congo, Uganda, or South Sudan in the last 21 days, contribute to this low risk. Travelers with U.S. passports are subject to health screenings at four designated airports.
CDC’s modeling report projects the outbreak trajectory based on factors like existing infections and deaths, and the effectiveness of isolation efforts. Simulations suggest at least 20,000 cases and 4,000 deaths in Africa within three months if around 50 people had died and 20% of infected individuals were isolated by late May. Higher isolation rates, between 50% and 70%, could reduce cases to about 10,000. However, if actual deaths exceed recognized figures by late May, outcomes could worsen.
CDC modeling during the West Africa Ebola outbreak in 2014 was also deemed inaccurate, with estimates predicting up to 1.4 million infections in an unmitigated scenario. This proved to be over 50 times the eventual outcome.