The World Health Organization said that the death toll for West Africa's Ebola outbreak has climbed past 1,200 but that there are tentative signs that progress is being made in containing the disease.
The three Liberians are being treated with the last known doses of ZMapp, a drug that had earlier been given to two infected Americans and a Spaniard. The Americans are also improving, but the Spaniard died.
Experts have said it is unclear if ZMapp, which had never before been tested in humans, is effective. Even if it is, the California-based maker has said more supplies won't be available for months.
In the meantime, experts say the best way to stop the spread of Ebola in West Africa is to identify the sick, isolate them from the healthy and monitor everyone with whom they have been in contact.
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Authorities have struggled to treat and isolate the sick, in part because of widespread fear that treatment centers are places where people go to die. Many sick people have hidden in their homes, relatives have sometimes taken their loved ones away from health centers, and mobs have occasionally attacked health workers.
On Saturday, residents of the West Point slum in Liberia's capital of Monrovia attacked a center where people were being monitored for Ebola. The raid was triggered by fears that people with the disease were being brought there from all over the country, the Information Ministry said today.
All the patients who fled are now being screened at a hospital in Monrovia, and those who tested positive are being treated, the ministry said. It was unclear how many of the 37 who fled were confirmed with Ebola. In addition, residents of the slum have agreed to return any stolen items, officials said.