— WHO (@WHO) March 2, 2016
Human-to-human transmission directly linked to the 2014 Ebola virus disease (EVD) outbreak in West Africa was declared to have ended in Sierra Leone on 7 November 2015. The country then entered a 90-day period of enhanced surveillance to ensure the rapid detection of any further cases that might arise as a result of a missed transmission chain, reintroduction from an animal reservoir, or re-emergence of virus that had persisted in a survivor. On 14 January, 68 days into the 90-day surveillance period, a new confirmed case of EVD was reported after a post-mortem swab collected from a deceased 22-year-old woman tested positive for Ebola virus. On 20 January, the aunt of the index case developed symptoms and tested positive for Ebola virus. No further cases were reported, and the aunt was discharged from treatment on 4 February after providing a second consecutive negative blood sample (RT-PCR) and was discharged. All contacts linked to the two cases had completed follow-up by 11 February 2016. If no further cases are detected, transmission linked to this cluster of cases will be declared to have ended on 17 March.
Human-to-human transmission linked to the most recent cluster of cases in Liberia was declared to have ended on 14 January 2016. Guinea was declared free of Ebola transmission on 29 December 2015, and is approximately halfway through a 90-day period of enhanced surveillance that is due to end on 27 March 2016.