Second Dallas Ebola Patient Raises Questions about Risk, Vigilance

A nurse who treated an Ebola patient from Liberia is the first person to contract the disease in the United States. It’s changed the strategy for coping with the disease in this country. Tom Frieden, Director of the US Centers for Disease Control and Prevention, said the following to reporters this morning: "The existence of the first case of Ebola spread in the U.S. changes some things and it doesn't change somethings. It doesn't change the fact that we know how Ebola spreads. It doesn't change the fact that it's possible to treat Ebola safely. But it does change substantially how we approach it."

Manny Fernandez is in Dallas for the New York Times.