In the deserted shops and marketplaces of west Africa's towns and cities, traders worry about a secondary, insidious effect of the world's most deadly Ebola outbreak: the prospect of financial ruin.

The tropical virus has claimed almost 900 lives since it emerged in the forests of southern Guinea at the start of the year, but it is also killing off business and threatening manufacturing.

Daily, long-term doses of aspirin can slash the risk of cancer of the digestive tract, according to an overview of research published on Wednesday.

Aspirin greatly reduces the risk of developing and dying from bowel, stomach and oesophageal cancer, its authors said.

The government of Sierra Leone has deployed hundreds of troops Ebola clinics, to enforce the isolation of patients, the president's office said on Tuesday.

A presidential aide told Agence France Presse the soldiers would "deter relatives and friends of suspected and Ebola patients from forcefully taking them from hospitals without medical consent".

An American woman infected with the dangerous Ebola virus -- the second U.S. patient evacuated from the growing outbreak in West Africa -- arrived Tuesday in the United States for treatment.

After landing at a military air strip aboard a small medical evacuation plane, Nancy Writebol, 60, was transported by ambulance to Emory University Hospital.

A Spanish missionary working in Liberia has tested positive for the deadly Ebola virus, the aid organization he works for said Tuesday.

Miguel Pajares, a 75-year-old Roman Catholic priest, tested positive for the disease at a hospital in the Liberian capital Monrovia where he worked, Spanish charity Juan Ciudad ONGD said in a statement.

A former government minister in Sierra Leone said on Tuesday that he has lost nine members of his family to the Ebola epidemic raging in west Africa.

Lansana Nyallah told state television the dead included his brothers and sisters in the eastern village of Daru, at the epicenter of the outbreak.

A video games enthusiast plays in Cologne, western Germany on August 22, 2013

Violent videogames glorifying antisocial characters could increase teenage gamers' risk of criminal and other risky behavior like smoking and alcohol use, a U.S. study said Monday.

Scientists said on Monday they had statistical evidence to back a novel theory that infection by the AIDS virus may reduce the risk of multiple sclerosis (MS).

Patients in England who were infected with the human immunodeficiency virus (HIV) were mathematically far less likely to develop MS than the general population they found.

The World Bank has pledged $200 million to help contain the deadly Ebola virus reaping panic across west Africa, as Nigerian authorities say a doctor in Lagos has contracted the disease, the second case in the sprawling city.

The confirmation that a fourth doctor in the region had developed Ebola came Monday as fear and anger about the dead being left unburied in Liberia's capital Monrovia brought protestors into the streets there.

The World Health Organization said Monday the death toll from the Ebola epidemic in west Africa has now reached 887 after 61 more fatalities recorded at the end of last week.

Giving an update on the deadly virus -- the worst Ebola outbreak ever -- the U.N. health agency said the 61 deaths were reported between last Thursday and Friday in Guinea, Liberia, Nigeria and Sierra Leone.