CDC modeling: Ebola outbreak in Central Africa could reach 20,000 cases without strong countermeasures
A new modelling study by US Centers for Disease Control and Prevention scientists projects that the ongoing Ebola outbreak in Central Africa could grow to about 20,000 cases over 12 months if it is not brought under control. According to STAT News, which obtained the paper, the base-case projection is more modest: between 5,000 and 7,500 cases.
The authors flag the risk that the outbreak will spread to urbanised areas along the border between the Democratic Republic of the Congo and Uganda. They name three variables that would tip the model toward its worst case: vaccine coverage, bed capacity and surveillance delay.
The CDC model uses a 28-day serial interval for the Bundibugyo strain of Ebola and a basic reproduction number between 1.8 and 2.4. These figures are close to the values used for the Zaire strain during the 2014-15 West African outbreak, which ended with 28,000 cases and more than 11,000 deaths.
Lead author Dr Maria Sundaram, speaking to STAT, said: "This is not a worst-case scenario, this is a scenario of inaction. If the pace of vaccination does not double over the next three months, the curve climbs." She added that the model, which works as an "early warning panel" for response partners, will be updated weekly.
The Coalition for Epidemic Preparedness Innovations (CEPI) and the International AIDS Vaccine Initiative (IAVI) had earmarked $62 million in additional funding for the experimental Bundibugyo vaccine; the dose distribution plan STAT reported on last week targets around 90,000 doses to date. The model suggests this volume needs to at least triple for effective coverage.
The US Department of Health and Human Services confirmed this week that high-risk Americans exposed to Ebola in Kenya will have access to the experimental therapy MBP-134. The decision offers important policy clarity for US health organisations that continue to deploy citizens on high-risk missions.
Dr Yap Boum, of Africa CDC, told STAT: "Vaccines matter, but they don't deliver without the basic infrastructure on the ground — task forces, transport and dignified burials." He also said the cross-border communication mechanism between DRC and Uganda had been strengthened.
The $518 million Africa CDC response plan, drafted with the World Health Organization, is aimed at the model's most optimistic scenario. The plan tightens donor coordination, digitises surveillance and rotates clinical teams on weekly cycles.
The authors stress that if the virus establishes itself in cities, even the lower bound of the model could be exceeded. They note that doubling times in dense settlements such as Kinshasa, Kampala or Goma could outrun current diagnostic capacity.
This article is general news reporting, not medical advice. People assessing their own Ebola risk should consult country travel advisories from the World Health Organization, as well as their physicians and vaccination providers.
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