During the past week, confirmed cases of swine flu influenza in Australia have jumped from 17 to 501. The island nation now has more cases than any country outside of the Americas. The outbreak is centered in the state of Victoria, which has 80% of the cases and has closed several schools. Until now, Chile with 250 has had the most confirmed cases in the Southern Hemisphere, a region that epidemiologists are watching closely as it is now entering winter, influenza's favorite season.
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