Authorities say a top Sierra Leone doctor treating ebola victims in the country has died from the disease.
The death came amid the largest outbreak of the haemorrhagic disease in history, deaths blamed on the disease in Sierra Leone, Liberia, Guinea and also Nigeria.
The disease has no vaccine and no specific treatment, with a fatality rate of at least 60 per cent.
An American doctor in Liberia was fighting for his life after also contracting Ebola, and authorities have begun health screening at airports and an airline has suspended flights after a man who took several flights died of the disease.
Sierra Leone doctor Dr Shek Umar had been hospitalised in quarantine since he contracted the virus that has killed more than 670 people across West Africa this year.
His death was confirmed by chief medical officer Dr Brima Kargbo.
Health workers have been especially vulnerable to contracting Ebola, which is spread through bodily fluids such as saliva, sweat, blood and urine.
INFECTED AMERICAN DOCTOR 'TERRIFIED'
Kent Brantly, an American doctor from Texas, was fighting for his survival in an isolation unit on the outskirts of Monrovia, Liberia, after contracting Ebola.
Bradley said he was "terrified" of the disease progressing further, according to Dr David Mcray, the director of maternal-child health at John Peter Smith Hospital in Fort Worth, where Brantly completed a four-year residency.
Police officers have been deployed to Liberia's international airport to ensure passengers are screened for Ebola symptoms as a major regional airline announced overnight it was suspending flights to the cities hardest hit by the outbreak.
A 40-year-old American man of Liberian descent who worked for the West African nation's Finance Ministry died on Friday (local time) in Nigeria after taking several flights on ASKY Airlines. At the time, Liberian authorities said they had not been requiring health checks of departing passengers in Monrovia.
"We have a presence of the police at the airport to enforce what we're doing," said Binyah Kesselly, chairman of the Liberia Airport Authority board. "So if you have a flight and you are not complying with the rules, we will not allow you to board."
Patrick Sawyer's sister had died of Ebola though he maintained he had not had close physical contact with her when she was sick. He took an ASKY Airlines flight from Liberia to Ghana, then on to Togo and eventually to Nigeria where he was immediately taken into quarantine until his death.
His travels have caused widespread fear at a time when the outbreak shows no signs of slowing in West Africa, where medical facilities are scarce and where some affected communities have in panic attacked the international health workers trying to help them.
ASKY said it was temporarily halting flights not only to Monrovia but also to Freetown, Sierra Leone. Flights will continue to the capital of the third major country where people have died - Guinea - though passengers departing from there will be "screened for signs of the virus."
Passengers at the airline's hub in Lome, Togo also will be screened by medical teams, it said.
"ASKY is determined to keep its passengers and staff safe during this unsettling time," the statement said.
The World Health Organisation says the risk of travellers contracting Ebola is considered low because it requires direct contact with bodily fluids or secretions such as urine, blood, sweat or saliva, experts say. Ebola can't be spread like flu through casual contact or breathing in the same air.
Patients are contagious only once the disease has progressed to the point they show symptoms, according to the WHO. And the most vulnerable are health care workers and relatives who come in much closer contact with the sick.
Still, the early symptoms of Ebola - fever, aches and sore throat - mirror many other diseases including malaria and typhoid, experts say. Only in later stages of Ebola do patients sometimes experience severe internal bleeding and blood coming out of their mouth, eyes or ears.
At the Finance Ministry where Sawyer worked, officials announced they were temporarily shutting down operations. All employees who came into contact with Sawyer before he left for Nigeria were being placed under surveillance, it said.
Despite the heightened precautions and reassurances from health workers, many Liberians said they were still fearful of contracting Ebola through casual contact.
Sam Mitchell who runs Sam's Barbeque, Monrovia's most popular fast food centre, has issued gloves to his workers and they are to wash their hands with chlorinated water before dealing with customers.
Garmie Gayflor, a hotel waitress, said that poverty was undermining the fight in her country.
"One does not have a car, and they say sweat from one affected person affects the others," she said. "We have six to seven person riding in the back of a taxi or bus."