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