New transmission from animals likely caused Congo-Uganda Ebola outbreak

The current Ebola outbreak affecting the Democratic Republic of Congo and Uganda is likely the result of a new transmission from animals to humans, according to a recent study. Researchers have identified a previously unseen variant of the Bundibugyo species of the virus, distinguishing it from strains linked to earlier outbreaks.

Analysis of genetic material from 22 patients in both countries revealed that the outbreak strain is genetically distinct from the Bundibugyo Ebola viruses observed in 2007 and 2012. Published in Nature Medicine, the findings strongly suggest the outbreak began with a novel animal-to-human spillover event, followed by human-to-human transmission.

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The findings, published on Monday in the journal Nature Medicine, suggest the outbreak began with a fresh animal-to-human transmission event and was then spread between people.

While the specific animal source remains unidentified, Ebola viruses are known to periodically jump from infected animals to humans. The genetic sequencing was crucial in confirming the link between cases detected in Uganda and the ongoing outbreak in Congo. The study's authors highlighted that improved access to testing and virus sequencing capabilities could significantly enhance the early detection and containment of future Ebola outbreaks.

Currently, there is no approved vaccine or treatment specifically for the Bundibugyo Ebola virus, although candidate vaccines and treatments are in development. The outbreak, declared on May 15, has resulted in over 2,000 deaths and 4,381 confirmed cases to date, according to the latest government figures.

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The study’s authors said wider access to testing and virus sequencing could help detect future Ebola outbreaks earlier and improve efforts to contain them.