WASHINGTON — U.S. health officials said Thursday they still don't know how two Dallas nurses caught Ebola from a patient, as criticism increased from lawmakers who questioned whether the nation is prepared to stop the deadly virus from spreading in the country. The revelation that one of the hospital nurses was cleared to fly on a commercial airline the day before she was diagnosed raised new alarms about the American response to the Ebola outbreak in West Africa. The death toll is expected to climb above 4,500 in Africa, all but a few within Liberia, Sierra Leone and New Guinea, the World Health Organization said. In Sierra Leone, the government announced the virus had infected two people...
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