結果 : how long are you contagious before you get the flu
2:59

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WATCH: How long do cold and flu viruses stay contagious on surfaces?

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How Long is the Flu Contagious? A Doctor Answers

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How Long Is The Flu Contagious

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風邪やインフルエンザ…やってはいけないこと!マンデル博士

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How long are you contagious for?

WXYZ-TV Detroit | Channel 7
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HOW LONG IS FLU CONTAGIOUS? How Long Do Symptoms Last? Should You Take Tamiflu? A Doc Discusses

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