Muhammad Ali's doctor has said he cannot be certain that the boxing great's remarkable career in the ring contributed to the former world heavyweight champion suffering from Parkinson's Disease.

It has long been asserted that the effect of taking punishing head blows in fights against the likes of George Foreman in the 'Rumble in the Jungle', whose 40th anniversary was celebrated this week, have been a key factor in Ali suffering from Parkinson's, a neurological condition which can cause its sufferers to shake and have problems with their balance.

Ebola is spreading up to nine times faster in parts of Sierra Leone than two months ago, a report by the Africa Governance Initiative (AGI) said on Sunday.

"Whilst new cases appear to have slowed in Liberia, Ebola is continuing to spread frighteningly quickly in parts of Sierra Leone," said the AGI report.

Citizens of Guinea, Liberia and Sierra Leone will need a visa to enter Singapore as part of measures against the spread of Ebola, the city-state's health ministry said Monday.

The three West African countries are the worst-hit by the Ebola epidemic that has killed more than 4,900 people.

A young American woman with terminal cancer has committed suicide, following promises to do so that had triggered shock and controversy over the right to die.

Brittany Maynard, a 29-year-old brain cancer sufferer, made headlines earlier this month when a video of her making her suicide threat went viral and was seen by millions of web users.

Lithuania on Saturday enacted a ban on selling energy drinks to anyone under 18, in what officials in the Baltic country claimed was a global first.

"It's a revolutionary development the world over: we didn't find a single other country to have this kind of ban," health ministry official Almantas Kranauskas told AFP.

Ebola has wiped out whole villages in Sierra Leone and may have caused many more deaths than the nearly 5,000 official global toll, a senior coordinator of the medical aid group MSF said Friday.

Rony Zachariah of Doctors Without Borders, known by its French initials MSF, said after visiting Sierra Leone that the Ebola figures were "under-reported", in an interview with AFP on the sidelines of a medical conference in Barcelona.

Canada's Conservative government said it is suspending visa applications for residents and nationals of countries with "widespread and persistent-intense transmission" of the Ebola virus.

With Friday's decision, Canada joined Australia in suspending entry visas for people from Ebola-stricken countries in West Africa in an attempt to keep the deadly disease away.

She is 44 and single, but journalist Sarah still dreams of having a child, while TV producer Susanah, 38, is waiting for her younger boyfriend to be ready.

To keep their hopes alive, these New York women have spent tens of thousands of dollars on freezing their eggs in a practice that has become increasingly popular.

A $500 million lawsuit against Kimberly-Clark Corp. alleges the company falsely claimed its surgical gowns protected against Ebola and other infectious diseases.

The suit, filed Wednesday in federal court, alleges that the multinational company knew for at least a year that its Microcool Breathable High Performance Surgical Gown had failed industry tests of impermeability to blood and microbes, but it continued to claim the product provided the highest level of protection against diseases including Ebola.

The Ebola virus is often deadly, but not always, and a study on mice Thursday suggested that genetics may play a role in the severity of the illness.

At a high-security, state-of-the-art biocontainment laboratory in Hamilton, Montana, scientists infected mice with a mouse form of the same species of the Ebola virus that is sweeping West Africa.