Liberia has discharged its two last known Ebola patients from a treatment center, beginning its third countdown to become free from transmission of the deadly virus, health authorities said Friday. Three cases were reported Nov. 20 in Liberia — one of the three West African countries hit hardest by the worst ever Ebola outbreak. One of them, a 15-year-old boy, died Nov. 23, the WHO website reported. The 42-day countdown to become free from transmission of the deadly virus started Friday. The World Health Organization declares that Ebola disease transmission has ended when the country goes through two incubation periods — 21 days each — without a new case emerging. Liberia was first declared Ebola-free May 9, but new cases emerged in June.
