How many Bundibugyo ebolavirus outbreaks are we missing?

Abstract

The 2026 outbreak of Bundibugyo virus disease (BVD) in the Democratic Republic of the Congo and Uganda highlights critical gaps in global preparedness for emerging infectious diseases. Previously considered rare, the Bundibugyo virus had been linked to only two recognized outbreaks, one in 2007–2008 and another in 2012. However, the current outbreak suggests that its apparent rarity may reflect limitations in diagnostic capabilities and epidemiological surveillance, rather than its true incidence. Non-specific clinical symptoms, genetic divergence from other Ebola virus species, and diagnostic systems designed primarily to detect the Zaire ebolavirus may contribute to delayed identification and underreporting. Conventional surveillance systems may overlook small, localized outbreaks, particularly in regions with limited access to healthcare and laboratory resources. Real-time genome sequencing, decentralized diagnostics, improved laboratory infrastructure, and international data sharing could strengthen the early detection and characterization of such outbreaks. Although the true incidence of BVD remains unknown, the current outbreak challenges the assumption that a low number of recognized outbreaks indicates that the pathogen is genuinely rare.

DOI: http://dx.doi.org/10.5281/zenodo.23576118