Swine flu sweeps Hong Kong, 46% up in a day
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Visitors wearing masks walk past a an infection control notice at a hospital in Hong Kong May 2, 2009. Hong Kong has escalated its alert level to `emergency`, the highest level, from `serious` in response to a Mexican testing positive for the territory`s first case of the influenza A (H1N1) virus, formerly referred to as swine flu. (Reuters Photo / Bobby Yip)