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Infectious Diseases

Updated 10 September 2015

Virus in semen may hamper Ebola eradication

The WHO urges all male survivors of Ebola to get tested three months after the onset of symptoms to minimise risk of transmission via semen.

Isolated flare-ups of Ebola may point to a higher risk of transmission via the semen of male survivors than previously thought, undermining hopes of ending West Africa's deadly outbreak by the end of the year.

The World Health Organisation's advice is that all male survivors should be tested three months after the onset of symptoms and then monthly until they know they have no risk of passing on the virus through their semen, Bruce Aylward, head of the WHO's Ebola response, told a news conference.

Read: The signs of Ebola

But a forthcoming study in the New England Journal of Medicine, based on around 200 survivors, found that around half still had traces of the virus in their semen after six months, a clinician familiar with the study told Reuters. "The old advice of three months is no longer good," the clinician said. "The number of people with persistent virus in their semen is much greater than expected." The clinician, who was not authorised to speak about the study, added that the risk might not only be from sex but also from masturbation.

Read: Ebola survivors told to use condoms

"It's not the sex that is dangerous, it's the semen that is dangerous," said Aylward, who mentioned the study during a news conference but did not give details. "How people actually get exposed, in soiled linens or whatever, is not clear.

"Transmission through semen may explain why a few cases continue to occur even though the outbreak has been almost completely eradicated by an intense international effort, recently bolstered by the deployment of a trial vaccine in Guinea and Sierra Leone. "This virus and this outbreak in particular has a nasty sting in the tail," Aylward said. "It's not finished, by a long shot."

The latest flare-up, in a village on the northern border of Sierra Leone, followed the death of a 67-year-old woman late last month, 50 days after the previous confirmed case in the region.

Transmission chains are considered to have been broken after 42 days with no new infections. However, Aylward said that sexual transmission was "obviously not a huge risk, because if it were we would have seen a lot more in the areas that were hardest hit at the beginning of this outbreak."

Read more:

Man spreads Ebola via sex 5 months after cured 

The signs of Ebola 

Could Ebola hit SA?

 

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