New rapid response tactics are needed to defeat the Ebola virus in Liberia, according to the charity Medecins Sans Frontieres (MSF).

More than 6,600 people have been infected in the country, but figures suggest the number of new infections has started to fall.
MSF says it now has more hospital capacity than patients and called for a shift in tactics.
It wants rapid response teams to tackle Ebola hotspots when they flare up.
Liberia has been the worst-hit country in the Ebola epidemic with nearly half of all cases.
However, it is the first to begin to turn around its fortunes - the rate of new infections is continuing to increase in Guinea and Sierra Leone.
The World Health Organization said it was feeling confident that it was getting the upper hand on the virus in Liberia.
MSF said that its treatment centre in the capital Monrovia had 250 beds but was treating just 50 patients.
Meanwhile a site in Foya, in the north of the country, has not had a single patient since 30 October.