The
Liberian woman, who became ill with the disease and is now dead, is the first
person known to contract the Ebola virus from sex, researchers reported this
week in the New England Journal of Medicine. Typically, people contract Ebola from direct
contact with the blood or other bodily fluids from a sick or recently deceased
patient.
But
experts knew that the Ebola virus can linger in patients after they’ve
recovered. And they
speculated
that sexual transmission was possible. After the virus is cleared from a
patient’s blood, it can turn up in semen and other fluids for weeks or
months—as long as nine months, new data suggest.
This
was the case for the male survivor, also Liberian, when he transmitted the
virus to his partner. His blood tested negative for the virus 155 days before
the pair had sex. But semen samples taken after the woman fell ill revealed he
was still shedding the virus.
Genetic
sequencing revealed that the two were infected with identical viruses, distinct
from other versions of the Ebola virus circulating in Western Africa. The
finding leaves little doubt of direct transmission between the survivor and his
partner.
Still, sexual transmission may not pose a
significant threat to public health. In an accompanying editorial, Armand
Sprecher of Doctors Without Borders wrote that “sexual transmission remains a
rare event,” noting that there are 17,000 survivors of the most recent Ebola
outbreak. If sexual transmission were

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