More than 6,800 people have now died from the Ebola virus, almost all of them in west Africa, the World Health Organization said Monday. The UN health agency reported that as of December 13, there had been 18,464 cases of infection from the deadly virus in Guinea, Liberia and Sierra Leone, and 6,841 people had died. WHO did not provide an update of cases in other countries, but last week said the death toll remained the same: six in Mali, one in the United States, and eight in Nigeria, which was declared Ebola free in October. Spain and Senegal, which have both been declared free from Ebola, meanwhile counted one case each, but no deaths. – Sierra Leone – Sierra Leone, which last week overtook Liberia as the nation with the most infections, counted 8,273 cases and 2,033 deaths on December 13. The toll up until December 10 stood at 8,069 cases and 1,899 deaths. – Liberia – Liberia, long the hardest-hit country, has meanwhile seen a decrease in the rate of transmission in recent weeks. A...