DRC Ebola Outbreak Accelerates at Unprecedented Pace, WHO Warns of Unknown Transmission Chains

Why this matters

• Third-largest Ebola outbreak ever recorded.
• Most new infections stem from unknown transmission chains.
• Virus has spread beyond the original outbreak zone.
• Early detection and global support remain critical.

Addressing reporters in Geneva following a visit to Bunia in the eastern DRC province of Ituri, the epicenter of the outbreak, Dr. Chikwe Ihekweazu, Executive Director of WHO’s Health Emergencies Programme, reported nearly 2,000 confirmed cases and over 700 deaths across five provinces as of July 11, making this the third-largest Ebola outbreak on record.

“We have seen the fastest growth in a single month since the outbreak began and across all Ebola outbreaks we have managed,” he stated.

“Over the last few days, we have recorded some of the highest single-day infection numbers,” Dr. Ihekweazu added, noting more than 80 confirmed cases within 24 hours.

Known unknowns

Many newly reported deaths involve individuals who died in their communities without ever reaching a health facility or receiving care—a finding the WHO official described as “the most alarming.”

Despite progress in diagnostics and high contact-tracing follow-up rates, “80 percent of new cases fall outside our contact lists, meaning they emerge from unknown chains of transmission,” Dr. Ihekweazu warned.

The outbreak was declared two months ago, almost to the day, and WHO modeling suggests the actual scale could be “at least two to four times” the reported figures.

“You have to imagine this is a fire,” Dr. Ihekweazu said. “There is something driving the fire at its core, and it is expanding simultaneously.”

While up to 95 percent of new cases originate in Ituri Province, where the outbreak began, the virus has recently spread to two additional provinces, Haut-Uele and Tshopo.

The WHO official outlined a two-pronged response strategy: continue pressing at the outbreak’s core in Ituri while simultaneously “understanding the travel routes… and mapping where the risks of new cases emerging are highest.”

Urging the international community not to grow “despondent” amid the disease’s rapid spread, the WHO official emphasized that response efforts are yielding results.

“Now is not the time to drop the ball,” he cautioned.

Therapeutic trials ongoing

Several therapeutics are undergoing clinical trials, though no approved treatment yet exists for patients infected with the Bundibugyo species of Ebola. Still, survival chances increase significantly with early supportive care.

“We must find cases earlier and bring them into care as soon as possible” to reduce community transmission and avoid falling behind the curve, Dr. Ihekweazu said.

Asked about recent attacks on healthcare workers and facilities, he explained that the solution lies in “being open and transparent” about the care provided.

“Before any new center opens, we invite community leaders to see what is being done and to speak with the healthcare providers who have left their homes to support the response,” he said.

Preventing attacks on healthcare depends on building community confidence in new facilities and demonstrating that “they are not going to be left alone—they will not only be treated, they will be offered food and have access to their families”.

As the struggle to halt Ebola’s spread in the DRC continues, Dr. Ihekweazu spoke of a “dissonance between the threats facing us and the efforts we are making to respond.”

“We need the world to come together, not just out of charity or support for the DRC, but in our own enlightened best interest. The more we do right now, the better placed we will be in the future,” he stressed.

The WHO official noted that at headquarters in Geneva, Member States are negotiating a key component of the WHO Pandemic Agreement—the Pathogen Access and Benefit Sharing (PABS) annex—which aims to ensure rapid sharing of genetic information on dangerous pathogens with pandemic potential and equitable access to vaccines and treatments for developing countries.

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