The World Health Organization (WHO) has declared Liberia Ebola-free, effectively putting an end to the world's worst outbreak of the disease.

An Ebola treatment centre in Liberia.
An Ebola treatment centre in Liberia.

The BBC reported that the WHO chief Margaret Chan announced that it was a "monumental achievement". Both Guinea and Sierra Leone, the two other countries most affected by the outbreak, were declared free of the disease last year. A nation is considered free of human-to-human transmission after 42 days without a new case – this is based on two 21-day incubation periods passing since the last known case tested negative for a second time.

Read more: bbc.co.uk 

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