Officials were trying to figure out how a nurse who had treated Thomas Eric Duncan became infected despite wearing protective gear, as news of the new infection stoked the fears of health care workers across the country.
On Sunday, for the second time in two weeks, Ebola transformed part of Dallas into a scene of concern and contamination, with another day of uneasy questions.
As Gov. Chris Christie lays the groundwork for a Republican presidential run, the distrust that he faces from social and religious conservatives may be the biggest and least understood obstacle.
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