Ebola restarting in Liberia

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MONROVIA, Liberia -- A woman who tested positive for Ebola in Liberia last week is dating a survivor of the disease, a health official said Tuesday, offering a possible explanation for how she became the country's first confirmed case in weeks.

Ebola is typically transmitted through contact with the blood, vomit or feces of people who are sick. Survivors of Ebola are not generally considered contagious, but the virus lingers in semen, and so scientists urge survivors not to have sex for three months after recovering. Even though sexual transmission of Ebola has not yet been documented, it may be possible.

The evidence is limited, but research conducted over the years suggests Ebola can remain in a patient's semen for up to 91 days -- much longer than other bodily fluids -- even after a patient has recovered and the virus is no longer detectable in a blood test.