Congo's Ebola outbreak doubles death toll in three weeks as vaccine gap widens

An Ebola outbreak in the Democratic Republic of Congo has killed 2,011 people from 4,381 confirmed cases, health officials confirmed on Tuesday. The toll approaches the country's deadliest epidemic, which claimed nearly 2,300 lives between 2018 and 2020, but the current surge is moving at a far quicker pace.

Declared on 15 May though likely circulating for weeks earlier, the outbreak took roughly nine weeks to reach its first 1,000 deaths. The second thousand came in just three. The virus has spread across five eastern and northeastern provinces, regions already destabilised by long-running conflict. It is the Democratic Republic of Congo's 17th Ebola surge and the largest in its history, with Gavi chief executive Sania Nishtar warning it could become the largest ever recorded.

Response efforts are being outpaced on multiple fronts. Many health workers have gone on strike over unpaid wages since the outbreak began. The World Health Organization says most new infections are appearing outside known contact chains, meaning transmission is largely invisible to surveillance teams. The case fatality rate stands at 45.9 per cent.

Vaccine trial recommended for cross-protection

On Friday, WHO vaccine experts recommended a full-scale human trial of Ervebo to test whether it offers cross-protection against the Bundibugyo strain. Early data from animal studies suggest it may provide some defence. Two experimental Bundibugyo-specific vaccines are in early human trials, with a third candidate in development.

"In the absence of an effective vaccine, control rests on identifying cases and then nursing them in secure facilities until they recover or sadly perish," said Paul Hunter, professor of medicine at the University of East Anglia. "In a remote region like this with an ongoing conflict and interrupted communications, routine surveillance can be very difficult and identifying cases early enough to prevent spread can be impossible."

Containment depends on access and trust

Ebola spreads through contact with bodily fluids and causes severe haemorrhagic fever. Without a matched vaccine, the response hinges on reaching communities, tracing contacts and isolating patients, all of which require trust, security and paid staff. Until those conditions improve, the outbreak is likely to continue outrunning the response.