(CNN) -- One of the countries hard hit by the Ebola outbreak in West Africa is not able to cope, a health worker said, calling on the international community to step up support.
Anja Wolz, emergency coordinator for Doctors Without Borders, spoke to CNN on Tuesday from an Ebola facility in Kailahun, Sierra Leone.
"I think that the government and the ministry of health here in Sierra Leone is not able to deal with this outbreak. We need much more help from international organizations -- as WHO, as CDC, as other organizations -- to come to support the government," Wolz said.
"Still we have unsafe burials; people who are doing the burial without disinfection of the body; still we have patients who are hiding themselves; still we have patients or contacts of patients who are running away because they are afraid."
Sierra Leone 'not able to deal' with Ebola
Sierra Leone, Guinea and Liberia are at the center of an Ebola outbreak that has already killed more than 800 people.
The global concern over the spread of the virus has reached Saudi Arabia, where a man is in critical condition after recently returning from Sierra Leone.
The 40-year-old man has symptoms of a viral hemorrhagic fever, the Saudi Health Ministry said Tuesday. The source of his infection is unknown, but Ebola cannot be ruled out, the ministry said.
"This is the biggest and most complex Ebola outbreak in history," Dr. Tom Frieden, director of the Centers for Disease Control and Prevention, said in a statement.
"It will take many months, and it won't be easy, but Ebola can be stopped," he said. "We know what needs to be done."
The virus has already been confirmed outside of the three main countries.