Ten people thought to have been at high risk of exposure to an Ebola patient in the US are being closely monitored under isolation.
Officials in Dallas said four people who had shared a flat with Thomas Duncan were being kept indoors.
Altogether fifty people are under surveillance – down from the 100 initially feared to have had contact with the Liberian man.
Duncan arrived in Dallas from Liberia last month.
The authorities in Monrovia say they intend to prosecute him, claiming he lied in saying he had not come into contact with an infected person, when he gave details about his health before leaving for the States.
An American cameraman working for NBC in Liberia is due to be flown home for treatment after being diagnosed with Ebola.
More than 2,000 people have been killed by Ebola in Liberia, making it the country hardest hit by the virus.