The 2026 Bundibugyo Ebola Outbreak: What We Know in Early June

• DRC: 344 confirmed cases, 60 confirmed deaths, and 116 suspected cases still under investigation.
• Uganda: 15 confirmed cases and 1 confirmed death. Of these, at least 7 cases are associated with local transmission events, and 4 are linked to travel from the DRC.

The vast majority of DRC cases are concentrated in the eastern provinces of Ituri, North Kivu, and South Kivu, particularly in health zones like Rwampara and Bunia . In Uganda, eight of nine geographically identified cases were reported in the capital, Kampala, with one in the neighboring district of Wakiso .

A Complex Cross-Border Crisis

The outbreak is notable for being the first confirmed Bundibugyo ebolavirus outbreak since 2012, and the very first to be identified as cross-border from its outset . It has exposed deep vulnerabilities in regional surveillance and contact tracing systems. The International Rescue Committee (IRC) issued a dire warning on June 1, stating the virus may have been spreading undetected for as long as three months before the first official cases were confirmed in mid-May .

Critically, the IRC reported that only about 20% of contacts are currently being traced, a dangerously low figure that means health authorities are struggling to identify and isolate new transmission chains . The WHO’s Director-General reinforced this concern on June 3, noting that only about 45% of contacts had been followed up, far short of the 90% target needed to get ahead of the outbreak .

The UAE Travel Case

Adding to the complexity, a Congolese resident who traveled through the United Arab Emirates before arriving in Uganda has been confirmed as one of Uganda's 15 cases . The WHO is working with public health authorities in both Uganda and the UAE to assess the risk of exposure during travel and to facilitate international contact tracing . This case underscores the potential for further geographic spread. Earlier, a U.S. citizen was also confirmed infected and transferred for care .

International Travel Restrictions and Advisories

In response to the escalating crisis and the PHEIC declaration, a growing list of nations has imposed travel restrictions or advisories, even as the WHO formally advises against such measures, citing a lack of scientific evidence .

• United States: The CDC temporarily restricted entry for certain non-citizen travelers recently in the DRC, Uganda, or South Sudan. U.S. citizens and nationals are allowed to enter but face enhanced public health screening . The CDC advises all returning travelers to monitor for symptoms for 21 days .
• Uganda: The country closed its border with the DRC for at least four weeks in late May, allowing only essential cargo, aid, and security personnel to cross after screening . Uganda also temporarily halted flights to and from the DRC .
• Rwanda: Imposed travel restrictions in an effort to prevent the virus from spreading .
• United Arab Emirates: Issued a national health advisory against all non-essential travel to Uganda, the DRC, and South Sudan, and heightened vigilance for incoming cases .
• Canada, Bahrain, Jordan, and Thailand: These nations have also been cited as imposing travel-related measures, in addition to longstanding advisories by countries like Ireland advising against all travel to the DRC .

Strain Severity and the Vaccine Gap

The Bundibugyo virus (BDBV) is a distinct species of the Ebolavirus genus, and it carries an estimated case fatality rate of 30% to 50% . Unlike the Zaire ebolavirus behind the large 2014-16 West Africa epidemic, no vaccines or specific antiviral treatments have been approved for the Bundibugyo strain . This leaves health workers reliant on supportive clinical care and non-pharmaceutical interventions like isolation and safe burials—tools that are only effective when cases and their contacts are rapidly identified. In this outbreak, the severely constrained contact tracing threatens to undermine the entire containment strategy . Work is ongoing to test promising vaccine candidates, but for now, the medical toolkit remains dangerously limited .

The WHO has assessed the risk as "Very high" for the DRC and "High" for Uganda, while neighboring countries are considered at significant risk for further spread . With conflict, hunger, and a fragile health system complicating the on-the-ground response in eastern DRC, global health officials are racing to close the gap between the outbreak’s likely true scale and the containment effort’s current reach .