Concerns, questions as Dallas becomes 'ground zero' for Ebola in U.S.

Dallas; US: The first case of Ebola diagnosed in the United States - a man being treated in a Dallas hospital - has sparked worries that the virus that has killed thousands in West Africa could spread in one of the country's largest metropolitan regions.

But there is also a sense of confidence in a city that often brims with bravado and has some of the top hospitals in the country, as well as a public health system that has managed incidents such as a major outbreak of West Nile virus.