Ebola outbreak 'most challenging' as Guinea deaths pass 100

                     
                                 
It was "one of the most challenging Ebola outbreaks we have ever dealt with" and could take another four months to contain, the WHO said. The virus had now killed 101 people in Guinea and 10 in Liberia, it said.

Ebola is spread by close contact and kills between 25% and 90% of its victims. Many West African states have porous borders, and people travel frequently between countries.



'High alert'
Southern Guinea is at the epicentre of the outbreak, with the first case reported last month.

The geographical spread of the outbreak is continuing to make it particularly challenging to contain - past outbreaks have involved much smaller areas.

"We fully expect to be engaged in this outbreak for the next two to three to four months before we are comfortable that we are through it," Keija Fukuda, WHO's assistant director-general, said at a news briefing in Geneva, Reuters news agency reports.

The WHO said 157 suspected cases had been recorded in Guinea, including 20 in the capital, Conakry.