Liberia's chief medical officer is placing herself under quarantine for 21 days after her office assistant died of Ebola. Bernice Dahn, a deputy health minister who has represented Liberia at regional conferences intended to combat the ongoing epidemic, told The Associated Press on Saturday that she did not have any Ebola symptoms but wanted to ensure she was not infected. The World Health Organization says 21 days is the maximum incubation period for Ebola, which has killed more than 3,000 people across West Africa and is hitting Liberia especially hard. WHO figures released Friday said 150 people died in the...