The reason why Influenza H1N1 had became worldwide issue is that this epidemic spread rapidly and because Influenza H1N1 is mutated virus, it was difficult to predict prognosis and what complications would develop.
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The reason why Influenza H1N1 had became worldwide issue is that this epidemic spread rapidly and because Influenza H1N1 is mutated virus, it was difficult to predict prognosis and what complications would develop.
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