The Ebola virus can stay in a man's semen for nine months or longer and in one case, a survivor infected someone else after being cleared for the virus, researchers reported.
"We believe it's rare," said Dr. Barbara Knust, who helped lead CDC's Ebola response team.
The studies reveal that the epidemic, which killed more than 11,000 people in Guinea, Sierra Leone and Liberia, could have long-term effects.
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One report in the New England Journal of Medicine confirms what experts had feared - a 44-year-old woman who died in Liberia last March was infected by her fiancé, who had survived Ebola.