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.
Although Ebola activity in Guinea may have stabilized, cases continue to rise briskly in Sierra Leone and Liberia.
