Ebola Outbreak Could Be Three Times Larger With More Than 10,000 Cases According To Epidemiological Models: Africa CDC

Newsletter Edition #375 [The Files Brief]

Readers,

In this quick edition, we bring you updates on the Ebola outbreak from the Africa CDC based on a press briefing held yesterday. Also see below updates from the WHO.

The second IHR Emergency Committee meeting on the Bundibugyo virus disease epidemic in the DRC was held this week. Official communication from the meeting is awaited. WHO has already said, that the Ebola outbreak remains a public health emergency of international concern as per advice of the committee.

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THE FILES BRIEF

Ebola Outbreak Could Be Three Times Larger With More Than 10,000 Cases According To Epidemiological Models: Africa CDC

I. AFRICA CDC (AUGUST 20, 2026)

Outbreak Status & Epidemiological Scale

Unprecedented Outbreak Scale: The current Ebola outbreak is the fastest-growing outbreak, the second-largest outbreak overall, and the largest in the history of the DRC.
Cumulative Toll and Fatality Rate: As of the briefing, the DRC has recorded a cumulative total of 5,105 cases and 2,420 deaths, representing a very high case fatality ratio (CFR) of 47%.
Recoveries and Isolation: The response has reported 1,081 recoveries so far, with 762 patients currently in isolation.
Episodic Epicenters and Active Areas: Ituri Province remains the primary epicenter of the outbreak, though the provinces of North Kivu, South Kivu, and the specific areas in Ituri where the outbreak first began have not reported any new cases for 79 days.
Cross-Border Risks: Two new cases were recently reported in Bawele in the town of Buta, presenting a significant threat due to its close proximity to the Central African Republic (CAR).
Cross-Border Surveillance and CAR Preparedness: High-level cross-border engagement between the President of CAR, the Africa CDC Director General (Jean Kesaya), and the WHO has strengthened surveillance, with CAR setting up a laboratory, training health workers, and preparing an Ebola treatment center on its side of the border.
Slowing Transmission in Specific Zones: Three health zones—Mureza, Kambala, and Goma—have surpassed 42 days without any documented active transmission, though the end of the outbreak cannot yet be declared there as other provinces remain at risk.
Alarming Growth Compared to West Africa: At week 13, this outbreak has recorded 10 times more cases and 7 times more deaths than the historic West Africa outbreak did at the same point in time.

Challenges in Transmission, Detection & Surveillance

The Bundibugyo Species: Unlike previous outbreaks, the response is dealing with the Bundibugyo Ebola species and not the Zaire species.
Milder Symptoms Leading to Underreporting: Because the Bundibugyo species presents milder clinical symptoms (such as a lack of bleeding) compared to the Zaire species, community members feel a lower perceived need to seek care at treatment centers, suppressing official case counts.
Severe Underdetection of Cases: Epidemiological models estimate that only 30% to 40% of cases are currently being detected, meaning the actual size of the outbreak could be three times larger, potentially exceeding 10,000 to 15,000 cases.
Challenging Contact Tracing Metrics: In the DRC, only 10 contacts are identified per confirmed case (compared to 41 in Uganda and 57 in the DRC's 2018–2020 outbreak); less than 10% of cases come from known contacts, and less than 40% have an epidemiological link to a confirmed case.
Insecurity Inhibiting Contact Tracing: Due to security issues and humanitarian challenges in hotspots like PK 51, individuals are often unwilling or unable to provide names of contacts beyond their immediate households.
High Rate of Community Deaths: Over the five days prior to the briefing, community deaths (which include those dying at home or in facilities lacking proper infection prevention) made up at least 97% of all reported deaths.
Low Community-Sourced Alerts: Only 20% of alerts come directly from the community, whereas 50% are reported from health facilities, indicating a persistent gap in community-level surveillance.
Funeral Transmission Dynamics: Deceased bodies pose a higher transmission risk than living patients, and traditional funerals remain a primary source of transmission because families interact with the bodies before safe burial teams arrive.
Nosocomial Spread in Private Facilities: Many patients seek care in private facilities that lack proper Infection Prevention and Control (IPC) measures, causing healthcare workers and patients to contract Ebola and spread it to their households.

Laboratory & Logistical Achievements

Decentralized Laboratory Network: The response has deployed 19 active laboratories from the onset of the outbreak, alongside two mobile laboratories located in Cassini and Ahu.
Turnaround Time Drastically Reduced: Laboratory turnaround times have been reduced from 7–10 days down to 24 hours, and can be as low as 6 hours in treatment centers where equipment is directly positioned.
Logistical Road Barriers: Poor road conditions severely delay transport—traveling 200 kilometers to some hotspots can take up to 8 hours—making local, decentralized testing a necessity.
Increased Testing Capacity: The active laboratories have a combined processing capacity of 3,150 tests per day.
Extreme Fatality in North Kivu: North Kivu has a case fatality ratio of approximately 70%, reflecting critical gaps in local surveillance, case isolation, and community trust.
Improving Safe and Dignified Burials: The rate of safe and dignified burials (SDB) within 24 hours has increased to 95%, up from a previous low of only 30%, which has helped rebuild community trust.

Vaccine & Therapeutics Research

Clinical Therapeutics Trials: Clinical trials are active in hotspots, including the Partners trial evaluating Remdesivir and MB134 (MB111 3034), which has reached 200 enrolled patients.
Post-Exposure Prophylaxis (PEP) Trials: The clinical trial for the PEP drug Obeldesivir vs. placebo has enrolled 65 patients, showing a 200% increase since the previous report.
Vaccine Candidate Pipeline: Early-stage vaccine trials are underway, including ChAdOx (Phase 1 started July 20th), mRNA (Phase 1 in Canada), and Ervebo.
Ervebo Efficacy and Stockpile: The Ervebo vaccine is an approved, effective vaccine against the Zaire species with a stockpile of 500,000 doses managed by the International Coordinating Group (ICG).
Cross-Protection Potential: Scientific evidence indicates that Ervebo could provide cross-protection against the Bundibugyo species, particularly in protecting against severe disease.
Compassionate Use Funding: The ICG recently allocated $50,000 for a protocol-governed compassionate-use observational study of Ervebo in frontline workers and at-risk populations.
Three Strategic Vaccination Pathways: Depending on the area, the response plans to implement: vaccination of frontline workers; ring vaccination where contact tracing is functional; and targeted geographic vaccination of entire communities in high-transmission, low-tracing zones.
Bed Occupancy Status: Overall bed occupancy in Ebola treatment centers is between 62% and 66%

The Village-Centered Response (VCR) Strategy

Launch of the VCR: On August 5, under the direction of the DRC President and following a joint visit from the Africa CDC and WHO, the DRC government activated a digitized Village-Centered Response. The VCR structures the response at the lowest level using three community health workers per village, led by the village chief in an oversight and command role.

We misspelt CDC Director-General's name: Jean Kaseya. Now rectified a few minutes after publishing. August 21, 2026. We apologize.

RESPONSES TO QUESTIONS BY CDC OFFICIALS

Here is the summary of the questions asked during the weekly press briefing, including the respective speakers and their detailed responses:

WHO Pandemic Emergency Status & Criteria

Yap Boum II (Head of Emergency Preparedness and Response, Africa CDC)

While Africa CDC is not directly involved in the WHO Emergency Committee meetings, they work closely together. Regarding whether the outbreak meets the criteria for elevated emergency status, Boum confirmed it meets multiple critical benchmarks: high disease severity (case fatality ratio above 46%), complex transmission dynamics, a heavily burdened health system, limited vaccine and treatment availability, extreme public health risks (high community deaths), and severe social and economic impacts—such as closed border zones and the closure of the Bunya airport.

2. Funding Timelines and Bed Occupancy

Out of the global response budget, approximately 47% of pledged funds have actually been released. This includes tracking commitments like the $242 million promised by the United States. Africa CDC is actively supporting the DRC Ministry of Health with a financial tracker to ensure transparency and accountability.

The overall bed occupancy in Ebola treatment centers ranges between 62% and 66%.

3. Drivers of Community Transmission

Kyeng Mercy (Head of the Epidemic Intelligence Unit, Africa CDC) and Landry Tsague (Primary Health Care, Africa CDC )

Mercy explained that community transmission is driven by a cocktail of factors: high population mobility across transit routes that connect different major cities; a high proportion of community deaths (over 60% of all deaths), which leads to family exposure during traditional funerals before safe burial teams arrive; and patients seeking care in private health clinics that lack proper Infection Prevention and Control (IPC) measures, leading to nosocomial (facility-acquired) infections among healthcare workers and patients who then infect their households.

Landry adds that a lack of community trust was a fundamental gap in the early response. In response, the DRC government activated a digitized Village-Centered Response (VCR) on August 5 to bring surveillance and case isolation down to the absolute local level.

4. Vaccine Efficacy

Professor Placide Mbala Kingeben, Director of Research, Clinical Trials and Innovation, Africa CDC

There is currently no data showing direct vaccine efficacy for the Ervebo vaccine against the Bundibugyo species. However, because the vaccine is approved, safe, and has shown scientific evidence of potential cross-protection against severe disease, Africa CDC is prioritizing clinical trials and compassionate use protocols to benefit the population.

5. Verifying the 3x Outbreak Size Modelling

Mercy clarified that because only 30% to 40% of cases are currently being detected, epidemiological models estimate the true size of the outbreak is likely three times larger, potentially between 10,000 and 15,000 cases.

Boum confirmed that according to collaborating models from the INRB and Imperial College London, the actual burden of cases is estimated to be three times what is officially reported. Because traditional contact tracing has become virtually useless in high-transmission hotspots, the response is transitioning away from standard contact tracking to the digitized village-centered, house-to-house active search model.

6. Shifting Response Tactics & Other Continental Outbreaks

Boum agreed that in high-transmission zones, contact tracing is no longer viable. However, in smaller border health zones like Mahagi and Aru, contact tracing and surveillance successfully prevented any new cases for over 50 days. In heavily affected areas, the response is actively pivoting to community-wide active case searching.

In addition, Africa CDC is actively managing multiple health crises simultaneously: cholera outbreaks in Central Africa (including CAR, Cameroon, and Chad) and mpox in Madagascar, Angola, and South Sudan.

Disclosure: We used AI to produce this edition.

II. WHO UPDATE ON EBOLA

Last week, the WHO had already said: "It is already the second-biggest Ebola epidemic on record, and it is moving faster than any previous Ebola outbreak. At its current pace, it is on track to eclipse the West African Ebola outbreak of 2014 to 2016."

WHO Director-General's opening remarks at the second IHR Emergency Committee meeting on Bundibugyo virus disease epidemic in the Democratic Republic of the Congo – 18 August 2026

In an update on social media platform X, DG Tedros Adhanom Ghebreyesus said:

"The #Ebola outbreak in #DRC remains a public health emergency of international concern, following the advice of today’s @WHO Emergency Committee meeting.

We call for the cooperation of all governments and all partners, working together as one, to scale up efforts even further, and raise the resources needed to protect communities over the coming months.

Updated recommendations to the government of DRC and other countries at risk will be issued in the coming days."

Formal communication from the WHO on the meeting outcome is awaited. This edition will be updated accordingly.

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