The World Health Organisation (WHO) on 14 January 2016 declared West Africa free from Ebola outbreak. The decision was taken by the WHO as all known chains of transmission have been stopped in Liberia, which was worst affected among all the nations in the region.
The declaration came 42 days (two 21-day incubation cycles of the virus) after the last confirmed patient in Liberia tested negative for the disease 2 times.
Since its outbreak in December 2013 in the region, Liberia was worst hit as it killed 4809 people in the country. And, the region as a whole saw around 11000 deaths due to the outbreak.
Apart from Liberia, Sierra Leone and Guinea were the other two most affected nations in the region. They were declared Ebola free in November 2015 and December 2015 respectively.
In the case of Liberia, the country was first declared free of Ebola transmission in May 2015, but the virus was re-introduced twice since then, with the latest flare-up in November.
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What: Declared by the WHO
When: 14 January 2016