There’s a new outbreak of Ebola in Africa. Here’s what you need to know

Origins and Current Status of the Outbreak

The latest Ebola outbreak in the DRC began in late August 2025, when a 34-year-old pregnant woman was admitted to a hospital in Kasai Province and died five days later. Two health workers who treated her also contracted the virus and succumbed to the disease. By mid-September, health authorities confirmed 81 cases and 28 deaths, including four health workers.

Genetic analysis indicates that this outbreak likely originated from a new spillover event from an animal host to humans, rather than being a continuation of previous epidemics. This is significant because the DRC has experienced 15 prior Ebola outbreaks, with the largest occurring in 2019 and the most recent in 2022. The identification of a new spillover underscores the persistent risk of zoonotic transmission in the region.

How Ebola Virus Spreads and Its Symptoms

Ebola virus disease was first identified in 1976 near the Ebola River in what is now the DRC. The natural reservoir of the virus is fruit bats, but humans can become infected through contact with infected animals such as bats, chimpanzees, antelopes, or porcupines.

Human-to-human transmission primarily occurs through direct contact with blood or bodily fluids of infected individuals. The incubation period ranges from two to 21 days, during which symptoms may not be apparent.

Initial symptoms include sudden onset of fever, fatigue, muscle pain, headaches, and sore throat. These early signs can rapidly progress to vomiting, diarrhea, abdominal pain, rash, bleeding, and shock. Without prompt and adequate treatment, the fatality rate can reach 50 to 90%, depending heavily on the quality of healthcare available.

Ebola spreads rapidly within families, healthcare settings, and during traditional funeral practices where contact with the deceased is common. Healthcare workers are particularly vulnerable due to close patient contact and potential exposure to contaminated needles or insufficient protective equipment.

Survivors can harbor the virus in immune-privileged sites such as the brain, eyes, or semen for months or even years, which in rare cases may lead to virus reactivation and new transmission chains.

Why Health Authorities Are Concerned

The largest recorded Ebola epidemic occurred between 2013 and 2016 in West Africa, infecting over 28,000 people and causing more than 11,000 deaths. Several factors contributed to the high death toll, including delayed outbreak detection, slow international response, weak health infrastructure, misinformation, and cultural practices surrounding funerals.

The current outbreak in the DRC is complicated by the country’s ongoing challenges, including concurrent epidemics of mpox, cholera, and measles, which strain healthcare resources. Additionally, armed conflict disrupts transportation and limits access to affected communities, hindering response efforts.

Kasai Province’s relative remoteness is offset by its proximity to Tshikapa, a provincial capital, and the neighboring country of Angola, where cross-border travel for trade and work increases the risk of wider spread.

Despite these challenges, the DRC’s experience with Ebola and the availability of new tools provide hope for more effective containment compared to previous outbreaks.

Vaccines and Treatment: New Tools in the Fight Against Ebola

A major advancement in Ebola control is the availability of the Ervebo vaccine (rVSV-ZEBOV), which targets the Zaire strain responsible for this outbreak. Clinical trials demonstrated 100% effectiveness when administered immediately after exposure and 95% effectiveness if given within 12 days post-exposure.

During the last Ebola outbreak in the DRC, the vaccine showed an 84% real-world effectiveness rate. The World Health Organization (WHO) is actively supporting vaccination efforts by supplying initial doses and facilitating ‘ring vaccination’ strategies, which involve immunizing contacts of confirmed cases and frontline health workers.

In addition to vaccination, controlling Ebola outbreaks relies on early isolation of suspected cases, rigorous contact tracing, and quarantine measures. Adequate hospital capacity, including field hospitals, is crucial for managing patients and preventing transmission.

Safe burial practices that avoid direct contact with bodies are essential to reduce spread during funerals. Supportive care, such as rehydration, electrolyte replacement, and monoclonal antibody treatments, can significantly improve survival rates.

However, challenges remain, including the need for cold chain logistics to transport vaccines to remote areas, difficulties in contact tracing in insecure regions, and ensuring a steady supply of protective equipment for healthcare workers.

The Importance of Early Detection and Surveillance

Early detection of outbreaks is vital to prevent widespread transmission. Innovative tools like EPIWATCH, an AI-driven open-source intelligence platform, monitor news, social media, and online reports for unusual disease activity.

EPIWATCH detected a surge in outbreak-related reports from the DRC in early September 2025, aligning with official case notifications. Such platforms can provide valuable early warnings, especially when laboratory diagnostic capacity is limited.

While these signals do not replace laboratory confirmation, they enable health authorities to respond more swiftly and allocate resources effectively.

Currently, the World Health Organization assesses the risk of this outbreak as high within the DRC, moderate for the surrounding region, and low at the global level. Prompt containment efforts could keep the outbreak localized and minimize wider impacts.

What this means

The emergence of a new Ebola outbreak in the Democratic Republic of the Congo underscores the ongoing threat posed by zoonotic diseases in regions with complex health and security challenges. While the virus remains highly dangerous, advances in vaccination, early detection, and supportive care offer hope for effective containment. Coordinated efforts by local authorities, international organizations, and communities are essential to prevent further spread and reduce fatalities. Vigilance, resource allocation, and adherence to safe practices will be key to managing this outbreak and mitigating its impact both within the DRC and beyond.