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Flu raises questions in sports world

Updated: May 1, 2009, 2:00 PM ET
By Dr. Michael Kaplan | ESPN Medical Analyst

Concerns have been raised during the past week about a potential "swine flu" pandemic. As of Thursday, the influenza virus, subtype H1N1, had caused at least 109 lab-confirmed cases in the United States and one death: a Mexican boy who became sick while visiting Brownsville, Texas. The emergence of this new strain raises a number of questions for the sporting world. Here are some of those questions and their answers:

What is the "swine flu" virus and why is it causing so much concern?

Taking ...

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