Only a day after the World Health Organization announced that an end was in sight for the Ebola epidemic in West Africa, scientists had less uplifting news: The virus may be mutating. "The response to the EVD (Ebola virus disease) epidemic has now moved to a second phase, as the focus shifts from slowing transmission to ending the epidemic," the WHO said in its latest report on the disease yesterday. There were 99 confirmed new cases last week, the lowest number since June. But researchers at the Institut Pasteur, the French medical-research organization that first identified the outbreak in Guinea last March, said that they're trying to determine whether the Ebola virus is becoming more contagious.
