The World Health Organization Saturday declared Liberia free of Ebola virus transmission, which it called “a monumental achievement for a country that reported the highest number of deaths in the largest, longest and most complex outbreak since Ebola first emerged in 1976.” Liberia’s last case was a woman in the Monrovia area who developed symptoms on March 20 and died March 27. The 332 people who may have been exposed to the patient were released from surveillance after none developed symptoms.