The case could mark the first local transmission of Ebola outside of West Africa.
The WHO enphasizes that the virus is known to spread only through contact with bodily fluids, and the CDC probes environmental persistence.
Of the 50 people identified for 21-day fever monitoring, only 10 had high-risk exposure.
So far no other infections have been found in connection with the first US-detected Ebola case.
As a WHO panel mapped out how to speed vaccine delivery, outbreak cases topped 7,000.
The man had revealed his travel history, and 5 schoolchildren are among his contacts.
Texas and CDC lab tests confirm the first US case detected outside of West Africa.
The new UN mission headquarters in Accra will have a strong presence in Guinea, Liberia, and Sierra Leone.
Airlifted out of Sierra Leone yesterday, a US doctor will be enrolled in a clinical trial.
As the outbreak tops 3,000 deaths, nations gather to push a global health plan.
