The Ebola virus may linger in the bodies of survivors for at least nine months, researchers reported last night – as the condition of a British nurse deteriorated following the return of infection.
The World Health Organisation study found traces of the virus in the semen of some male survivors nine months after their apparent recovery.
The study of 93 men in Sierra Leone found that 26% of those tested seven months or more after the illness tested positive for Ebola virus genetic material.
Researchers said the men were given counselling and condoms with their test results.
The findings were reported in the New England Journal of Medicine.
Researchers said further testing is under way to determine if the lingering viral material is alive and infectious.
WHO said education, counselling and testing of 8,000 male Ebola survivors in west Africa would be stepped up. The men are being advised they need two negative tests before they can have unprotected sex.
Bruce Aylward, from WHO, said: “These results come at a critically important time, reminding us that while Ebola case numbers continue to plummet, Ebola survivors and their families continue to struggle with the effects of the disease.
"This study provides further evidence that survivors need continued, substantial support for the next six to 12 months to meet these challenges and to ensure their partners are not exposed to potential virus."
Dr Tom Frieden, director of the US Center for Communicable Diseases, said: “Ebola survivors face an increasing number of recognized health complications.
"This study provides important new information about the persistence of Ebola virus in semen and helps us make recommendations to survivors and their loved ones to help them stay healthy."
* The condition of Scottish nurse Pauline Cafferkey was reported to be "critical" yesterday at the Royal Free Hospital, London. A hospital statement appeared to confirm she is suffering from a recurrence of Ebola infection.
The statement said: "We are sad to announce that Pauline Cafferkey’s condition has deteriorated and she is now critically ill. Pauline is being treated for Ebola in the high level isolation unit at the Royal Free Hospital."
NEJM 14 October 2015
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