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Rare Ebola Cousin Bundibugyo Surges in Congo, WHO Reports

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A Bundibugyo virus outbreak has caused 695 confirmed cases and 138 deaths in Congo and Uganda, exposing gaps in preparedness for rare pathogens.

A rare member of the Ebola family is spreading rapidly across the Democratic Republic of Congo, and its scale has already eclipsed every previously documented outbreak of the pathogen. The World Health Organization recorded 695 confirmed cases and 138 confirmed deaths in the DRC and Uganda as of June 11, a toll that far exceeds the two earlier events tied to the Bundibugyo virus.

The surge is the focus of a review published in the New England Journal of Medicine by Nancy Sullivan, a professor of biology, virology, immunology and microbiology at Boston University. Sullivan argues that the world's approach to dangerous diseases leans too heavily on the pathogens that generate the most headlines, leaving health systems exposed when an obscure virus returns without warning.

A filovirus with only two prior outbreaks

Bundibugyo sits within the filovirus family, the same group that produces the Ebola virus. Until now it had been linked to just two recognized outbreaks: one in Uganda in 2007 and a second in the DRC in 2012. The current episode has overtaken both, in the number of people infected and in how quickly it has moved.

The present outbreak was formally identified only after a nurse died. That detail underscores how the virus reaches the people closest to the sick. It passes from person to person through direct contact with infected bodily fluids, which places relatives, caregivers and medical staff at heightened risk, particularly in hospital wards that lack strong infection control.

The illness it produces is brutal. Bundibugyo can trigger a severe hemorrhagic fever marked by sweeping inflammation, injury and collapse of the cells that line blood vessels, bleeding that cannot be stopped, and the failure of several organs at once.

Symptoms that mimic malaria

One reason the virus is difficult to catch early is that its opening signs look like far more ordinary infections. Early symptoms shadow those of malaria, typhoid fever and other common conditions, so a firm diagnosis cannot be made at the bedside. Only laboratory testing can confirm that a patient carries the virus.

Sullivan describes containment as a set of steps that must click into place together and fast: confirming infections quickly, separating patients who test positive, tracking down anyone they may have exposed, tightening infection control and delivering supportive care. Each of those actions grows harder when a region has few laboratories and thin testing capacity.

In parts of the DRC, that capacity is exactly what is missing. Sullivan found that specimens often have to be carried long distances to reach national reference laboratories, turning what should be a fast test into a drawn-out process.

"Delays in specimen collection, transportation and testing can postpone confirmation by days or weeks, which hinders the isolation of infected persons, contact tracing and the initiation of outbreak-control measures," Sullivan wrote.

Every day lost to a slow result gives the virus more room. During an active outbreak, speed in identifying cases is what allows responders to wall off the infected and locate the exposed before the chain of transmission widens.

No vaccine built for Bundibugyo

The outbreak also highlights a blind spot in how the world stocks its medical arsenal. Researchers have made real headway on vaccines and treatments for the Ebola, Sudan and Marburg viruses. Bundibugyo has drawn no comparable effort. Because it strikes so seldom, no vaccine or therapy has ever been licensed to target it specifically.

For decades the virus registered barely a flicker of recognized activity, which is part of Sullivan's point. Its sudden reappearance as a serious threat shows how hard it is to forecast which infectious agent will drive the next crisis. She contends that countermeasures should be developed across a far wider range of pathogens capable of causing severe illness or death, rather than being concentrated on the handful already known for frequent outbreaks.

The Bundibugyo emergency, in her reading, is a test of whether preparedness can stretch beyond the familiar. Limited testing, a hospital-borne death that first exposed the outbreak, and the absence of any approved vaccine have combined to let a long-dormant virus climb past its own historical records - and to warn that the next surprise may come from a name few have heard.

Bundibugyo virus, Ebola outbreak, Democratic Republic of Congo, filovirus, hemorrhagic fever, WHO outbreak, Nancy Sullivan, outbreak preparedness

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