The Ebola outbreak in the Democratic Republic of Congo (DR Congo) is rapidly worsening, with the death toll now exceeding 2,000 and nearly 4,500 confirmed cases reported.

The World Health Organization has warned that the outbreak could potentially surpass the deadliest Ebola epidemic ever recorded if the spread is not brought under control. The virus has now reached five provinces, with Ituri remaining the epicentre of the crisis.

The speed of transmission has raised serious concerns. According to health officials, it took around nine weeks for the outbreak to reach its first 1,000 deaths, but the death toll doubled within just three weeks. Authorities are racing to strengthen surveillance, contain transmission and expand medical responses, but conflict, limited healthcare access and the absence of an approved vaccine or specific treatment for this Ebola virus species are making the response extremely challenging.

Ebola Outbreak Explodes In DR Congo, Death Toll Tops 2,000 Across Five Provinces

Ebola&nbsp;survivors can relapse and trigger outbreaks at least five years after infection, and long-term follow-up of former patients is needed to prevent devastating flare-ups, according to new research.

Scientists already knew&nbsp;Ebola&nbsp;could lie dormant in survivors, who test negative because the virus is in tissue rather than circulating in the blood.

But analysis of an outbreak this year in Guinea, published Wednesday in the journal Nature, found these "virus reservoirs" can awaken and cause new infections and transmission years on.

To trace the source of the Guinea outbreak, which involved 16 confirmed cases, 12 of whom died, researchers analysed the genomes of samples from several patients.

Ebola&nbsp;outbreaks are usually thought to result from the virus "spilling" from an animal host to a human.

But the analysis showed the Guinea strain was virtually identical to that from a 2013-16 wave.

If the virus had been circulating actively in the community since then, it would have accumulated a certain number of mutations as it spread.

Instead, the 2021 virus had just 12 changes, "far fewer than would be expected... during six years of sustained human-to-human transmission".

That strongly suggests the source was reactivated virus that had lain dormant in a survivor, said Alpha Keita, a researcher at the University of Montpellier who led the study.

"This is the longest known time between the declared end of an epidemic and a viral resurgence," he told AFP.

"It's a new paradigm: the possibility that transmission from an individual infected during a previous epidemic could be the source of a new outbreak."

ALSO READ | <a href="https://www.wionews.com/photos/what-is-ebola-origin-symptoms-and-treatment-of-a-virus-that-could-reappear-years-later-in-survivors-413329">What is Ebola?: Origin, symptoms and treatment of a virus that could reappear years later in survivors</a>

How and why dormant&nbsp;Ebola&nbsp;virus suddenly awakens and sickens a person remains something of a mystery, though there are some tantalising clues.

Sometimes a spike in&nbsp;Ebola&nbsp;antibodies can be detected in survivors at a given time -- a possible sign that the body is responding to a resurgent virus.

Around two-thirds of&nbsp;Ebola&nbsp;survivors have high antibody levels even five years after infection, but "the question to pose is what happens if there's a resurgence in the people whose immunity has dropped", said Keita.

Fears of stigma

The study's findings have "considerable implications for public health and care of survivors of&nbsp;Ebola", said Robert F. Garry of Tulane University's School of Medicine.

"Humans can now be added to the list of intermediate hosts that can serve as long-term&nbsp;Ebola&nbsp;virus 'reservoirs' and trigger new outbreaks," he wrote in a review commissioned by Nature.

He sees the need to prioritise healthcare workers for vaccination and monitor&nbsp;Ebola&nbsp;survivors for signs of a flare-up.

And Keita wants a rethink of the term "Ebola&nbsp;survivor" to include not only those who battled through symptoms but also those who may have been infected without becoming ill.

Even asymptomatic individuals "could be the starting point" for an outbreak, he warned.

"We need a real, long-term follow-up protocol for former&nbsp;Ebola&nbsp;patients and their contacts so we can catch resurgence in previously infected people in time."

He cautions though that follow-up must be done cautiously to avoid ostracisation of survivors, a point echoed by Trudie Lang, director of Oxford University's Global Health Network.

"These people are considered heroes by some for surviving," she said.

"Yet (they) could also be stigmatised and excluded if there is a fear of these individuals presenting a risk."

Lang, who was not involved in the study, called it "important new evidence," and a reminder of the need to support research on threats other than Covid-19.

Keita said the research paves the way for various additional study, including on what causes viral resurgence and the possibility of eradicating&nbsp;Ebola&nbsp;reservoirs in survivors.

Ebola survivors can relapse and trigger outbreaks at least five years after infection, and long-term follow-up of former patients is needed to prevent devastating flare-ups, according to new research.

Ebola survivors can relapse and trigger outbreaks at least five years after infection, and long-term follow-up of former patients is needed to prevent devastating flare-ups, according to new research. Scientists already knew Ebola could lie dormant in survivors, who test negative because the virus is in tissue rather than circulating in the blood. But analysis of an outbreak this year in Guinea, published Wednesday in the journal Nature, found these "virus reservoirs" can awaken and cause new infections and transmission years on. To trace the source of the Guinea outbreak, which involved 16 confirmed cases, 12 of whom died, researchers analysed the genomes of samples from several patients. Ebola outbreaks are usually thought to result from the virus "spilling" from an animal host to a human. But the analysis showed the Guinea strain was virtually identical to that from a 2013-16 wave. If the virus had been circulating actively in the community since then, it would have accumulated a certain number of mutations as it spread. Instead, the 2021 virus had just 12 changes, "far fewer than would be expected... during six years of sustained human-to-human transmission". That strongly suggests the source was reactivated virus that had lain dormant in a survivor, said Alpha Keita, a researcher at the University of Montpellier who led the study. "This is the longest known time between the declared end of an epidemic and a viral resurgence," he told AFP. "It's a new paradigm: the possibility that transmission from an individual infected during a previous epidemic could be the source of a new outbreak." ALSO READ | What is Ebola?: Origin, symptoms and treatment of a virus that could reappear years later in survivors How and why dormant Ebola virus suddenly awakens and sickens a person remains something of a mystery, though there are some tantalising clues. Sometimes a spike in Ebola antibodies can be detected in survivors at a given time -- a possible sign that the body is responding to a resurgent virus. Around two-thirds of Ebola survivors have high antibody levels even five years after infection, but "the question to pose is what happens if there's a resurgence in the people whose immunity has dropped", said Keita. Fears of stigma The study's findings have "considerable implications for public health and care of survivors of Ebola", said Robert F. Garry of Tulane University's School of Medicine. "Humans can now be added to the list of intermediate hosts that can serve as long-term Ebola virus 'reservoirs' and trigger new outbreaks," he wrote in a review commissioned by Nature. He sees the need to prioritise healthcare workers for vaccination and monitor Ebola survivors for signs of a flare-up. And Keita wants a rethink of the term "Ebola survivor" to include not only those who battled through symptoms but also those who may have been infected without becoming ill. Even asymptomatic individuals "could be the starting point" for an outbreak, he warned. "We need a real, long-term follow-up protocol for former Ebola patients and their contacts so we can catch resurgence in previously infected people in time." He cautions though that follow-up must be done cautiously to avoid ostracisation of survivors, a point echoed by Trudie Lang, director of Oxford University's Global Health Network. "These people are considered heroes by some for surviving," she said. "Yet (they) could also be stigmatised and excluded if there is a fear of these individuals presenting a risk." Lang, who was not involved in the study, called it "important new evidence," and a reminder of the need to support research on threats other than Covid-19. Keita said the research paves the way for various additional study, including on what causes viral resurgence and the possibility of eradicating Ebola reservoirs in survivors.

Ebola virus in survivors can trigger outbreaks years after infection

A person in the Democratic Republic of Congo who died of a hemorrhagic fever has tested positive for the Ebola virus,&nbsp;signaling the start of a new outbreak, the Health Ministry and the World Health Organization (WHO) said on Friday.

The case was confirmed from tests on nine people who came down with a hemorrhagic fever in Bas-Uele province in the north of the country on or after April 22, a ministry statement said. Three people have died of fever.

&quot;Our country must confront an outbreak of the Ebola virus that constitutes a public health crisis of international significance,&quot; the ministry said.

The WHO&#39;s Congo spokesman Eugene Kabambi told Reuters: &quot;It is in a very remote zone, very forested, so we are a little lucky. We always take this very seriously.&quot;

The last outbreak of Ebola in Congo was in 2014 and killed 42 people.

Ebola killed more than 11,300 people and infected some 28,600 from 2013, as it swept through Guinea, Sierra Leone and Liberia and caused alarm around the world.

In June last year WHO declared Liberia free of active Ebola virus transmission. Liberia was the last country still fighting the world&#39;s worst outbreak of the disease. 
 
(Reuters)

The case was confirmed from tests on 9 people who came down with a hemorrhagic fever in Bas-Uele province

A person in the Democratic Republic of Congo who died of a hemorrhagic fever has tested positive for the Ebola virus, signaling the start of a new outbreak, the Health Ministry and the World Health Organization (WHO) said on Friday. The case was confirmed from tests on nine people who came down with a hemorrhagic fever in Bas-Uele province in the north of the country on or after April 22, a ministry statement said. Three people have died of fever. "Our country must confront an outbreak of the Ebola virus that constitutes a public health crisis of international significance," the ministry said. The WHO's Congo spokesman Eugene Kabambi told Reuters: "It is in a very remote zone, very forested, so we are a little lucky. We always take this very seriously." The last outbreak of Ebola in Congo was in 2014 and killed 42 people. Ebola killed more than 11,300 people and infected some 28,600 from 2013, as it swept through Guinea, Sierra Leone and Liberia and caused alarm around the world. In June last year WHO declared Liberia free of active Ebola virus transmission. Liberia was the last country still fighting the world's worst outbreak of the disease. (Reuters)

One person dies of Ebola virus in Congo

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Ebola Outbreak Explodes In DR Congo, Death Toll Tops 2,000 Across Five Provinces

Ebola virus in survivors can trigger outbreaks years after infection

One person dies of Ebola virus in Congo