Ebola death toll surpasses 700
The worst recorded Ebola outbreak in history has surpassed 700 deaths in West Africa.
In Sierra Leone, president Ernest Bai Koroma vowed to quarantine sick patients at home and have authorities conduct house-to-house searches for others who may have been exposed as the country struggles with families resisting treatment at isolation centres.
Some have kept loved ones at home given the high death rates at clinics where Ebola patients are quarantined.
His announcement came as neighbouring Liberia also ramped up its efforts to slow the virulent disease's spread, shutting down schools and ordering most public servants to stay home from work.
The US Peace Corps is also evacuating hundreds of its volunteers in the affected countries. Two Peace Corps workers are under isolation outside the US after having contact with a person who later died of the Ebola virus, a State Department official said.
Ebola now has been blamed for 729 deaths in four West African countries this year, and has shown no signs of slowing down particularly in Liberia and Sierra Leone.
The World Health Organisation announced 57 new deaths on Thursday - 27 in Liberia, 20 in Guinea, nine in Sierra Leone and one in Nigeria.
Among the deaths this week was that of the chief doctor treating Ebola in Sierra Leone.
The government said Dr Sheik Humarr Khan's death was "an irreparable loss of this son of the soil". The 39-year-old was a leading doctor on hemorrhagic fevers in a nation with very few medical resources.
Ebola cases first emerged in the nation of Guinea back in March, and later spread across the borders to Liberia and Sierra Leone.
The outbreak is now the largest recorded in world history, and has infected three African capitals with international airports. Officials are trying to step up screening of passengers, though an American man was able to fly from Liberia to Nigeria, where authorities say he died days later from Ebola.
Ebola has no vaccine and no specific treatment, with a fatality rate of about 60% in this particular outbreak. But experts say the risk of travellers contracting it is considered low because it requires direct contact with bodily fluids or secretions such as urine, blood, sweat or saliva. Ebola cannot 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 World Health Organisation. The most vulnerable are health care workers and relatives who come in much closer contact with the sick.
In Liberia, authorities say 28 out of the 45 health workers who have contracted the disease so far have died. Two American health workers sick with the virus remain in isolation.