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New transmission from animals likely caused Congo-Uganda Ebola outbreak, study says
The genomes point to a recent animal spillover and show the virus spread from person to person for several months before Congo declared the outbreak.
On Tuesday, Nature Medicine published genomic analysis of the 2026 Congo Ebola outbreak, identifying a distinct Bundibugyo variant that likely emerged from recent animal spillover.
Genetic signatures confirm months of human transmission; analysis reveals twenty-five mutations, nine bearing the mark of ADAR, a human enzyme that attacks RNA during viral replication.
Researchers sequenced specimens from Institut National and Central Public Health Laboratories; only 22 genomes proved usable, and authors write the sample "precluded a robust estimation of the time to the most recent common ancestor."
The outbreak has surpassed 4,000 confirmed cases; field reconstructions in Mongbwalu suggest earlier deaths in January, while regional director Mohamed Yakub Janabi cited February as the likely start.
Nearly 1 million people have been displaced by conflict in Ituri province, where armed groups linked to the Islamic State operate; instability complicates surveillance and contact tracing, allowing the virus to spread undetected.
The current outbreak of Ebola in Congo is related to a variant of the Bundibugyo strain, indicating that it originated from a new transmission of animals to humans.