Clinical trials to try to find an effective treatment for Ebola patients are to start in West Africa next month.

The medical charity Medicins Sans Frontieres, which has been helping lead the fight against the virus, says three of its treatment centres will host three separate research projects.

Meanwhile, Liberia’s President Ellen Johnson Sirleaf has lifted the state of emergency imposed in the country.

She warned “this is not because the fight against Ebola is over”.

It marks the progress being made in the country, where the weekly number of new infections is falling.

In a radio address she told the nation that night curfews would be reduced, weekly markets could take place and preparations were being made for the re-opening of schools.