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Why is the flu seasonal?

Why is the flu seasonal? 9NEWS at 4 p.m. 01/02/13

http://www.9news.com/video/2069326839001/1/Why-is-the-flu-seasonal http://bcdownload.gannett.edgesuite.net/kusa/34295199001/34295199001_2069390528001_th-50e4c9a3e4b0f63868b915f0-806787298001.jpg?pubId=34295199001 Why is the flu seasonal? Why is the flu seasonal? 9NEWS at 4 p.m. 01/02/13 jan13january 2013as seen onnationalasseenonKUSAHealthNews 01:00

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