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WHO downgrades Ebola health risk

Ebola is no longer an "extraordinary health event" and the risk of the virus spreading is low, the World Health Organization says.

It means the disease is not thought to be a significant public health threat to countries outside of those affected in West Africa.

A small cluster of cases are still occurring in Guinea, but Sierra Leone and Liberia have not had any in months.

But experts say countries must remain vigilant for new flare ups of Ebola.

There have been 12 of these to date - the most recent on 17 March in Guinea. The WHO says countries have been able to react to these clusters quickly to contain them.

And all original chains of Ebola transmission have ended in the three West African countries that were plagued by the disease.

Ebola is spread by close physical contact. The virus is carried in bodily fluids - blood, vomit and saliva - which means people who care for the sick are vulnerable to catching the infection.

It has also been detected in the semen of male survivors, and the WHO says national and international efforts must be intensified to ensure such men can have their semen checked to know if they might still be able to spread the infection.

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