Meanwhile, Liberia's president ordered the nation's schools to shut down and most civil servants to stay home as fears deepened over the virus that already has killed more than 670 people in West Africa.
The Peace Corps said yesterday it was evacuating 340 volunteers from Liberia as well as neighboring Guinea and Sierra Leone.
Ebola has no vaccine and no specific treatment, with a fatality rate of at least 60 per cent.
President Ellen Johnson Sirleaf, who is skipping a summit of African leaders in Washington this week amid the crisis, also called for the closure of markets in an area near the borders with infected countries Guinea and Sierra Leone.
"My fellow Liberians, Ebola is real, Ebola is contagious and Ebola kills," she warned. "Denying that the disease exists is not doing your part, so keep yourselves and your loved ones safe."
In anger, one man recently set fire to part of the health ministry building in the Liberian capital, Monrovia, after his teenage brother reportedly died of Ebola.
Sirleaf said that security forces would enforce the new precautions taken a week after an American man of Liberian descent boarded a plane in Monrovia and flew to Nigeria, where authorities said he died of Ebola.
