WHO study finds 70% chance DRC Ebola spreads to South Sudan

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WHO study finds 70% chance DRC Ebola spreads to South Sudan
WHO study finds 70% chance DRC Ebola spreads to South Sudan

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The Bundibugyo Ebola outbreak ravaging eastern Democratic Republic of Congo has crossed 1,100 confirmed cases with 291 deaths, and a new WHO modeling study warns there is a nearly 70% probability the virus will reach South Sudan within 12 weeks, according to research published June 25 in The Lancet Infectious Diseases. eurekalert.org news-medical.net thelancet.com

The study, which draws on transmission data through June 22, confirms that the outbreak — already the second-largest in Ebola’s recorded history — has established confirmed transmission in Uganda, where 20 cases and two deaths have been documented, including five infections among healthcare workers. news-medical.net ecdc.europa.eu eurekalert.org

An Outbreak Born of Delay

The DRC’s Ministry of Health declared the outbreak on May 15, and WHO designated it a Public Health Emergency of International Concern two days later. But retrospective investigations indicate transmission of the rare Bundibugyo ebolavirus began undetected in early April, with the CDC’s branching-process model estimating the initial spillover event occurred as far back as mid-to-late February. forbes.com news-medical.net afro.who.int cdc.gov

That weeks-long gap between emergence and detection is the primary driver of the outbreak’s explosive trajectory, according to the CDC. “This analysis did not provide evidence that R₀ for this outbreak is unusually large,” the agency wrote in its MMWR report, concluding instead that the outbreak’s scale stems from its size at the time of initial confirmation. cdc.gov

Response Outpaced

As of June 23, the European Centre for Disease Prevention and Control reported 1,118 confirmed cases across DRC’s Ituri, North Kivu, and South Kivu provinces, with 24 new cases logged in a single day. A confirmed case has also been reported in France, and one earlier case was medically evacuated to Germany. ecdc.europa.eu

The contact tracing capacity that underpins Ebola containment remains strained. WHO reported on June 8 that health workers were reaching 62% of identified contacts — an improvement, but still well below the 90-95% follow-up rate the agency says is needed to break transmission chains. Conflict in Ituri and North Kivu has compounded the challenge, with at least four Ebola treatment centers attacked in recent weeks. cidrap.umn.edu news.un.org

What Comes Next

The Lancet study identifies South Sudan as the most urgent preparedness priority, estimating a 69.3% probability of at least one case arriving there within its 12-week modeling window. Under a worst-case scenario in which control measures lapse, the WHO model projects the outbreak could surpass 66,000 confirmed cases by September. news-medical.net eurekalert.org

No approved vaccine or therapeutic exists for the Bundibugyo strain, which shares only 55-60% surface protein similarity with the Zaire ebolavirus targeted by the licensed Ervebo vaccine. CDC has maintained that the risk to the U.S. public remains low, while the State Department has committed more than $162 million in foreign assistance to the response. cdc.gov state.gov afro.who.int forbes.com

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