Do you know swine influenza?

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do you know swine flu, my friends? Recently, the swine flu coming from Mexico is tending to spread to the whole world, fear and anxiety are among us. we can see any protection means in the street.and, however, anytime do you think where is it from, and why it come to our humanbeing? though it is an old flu erupted in USA in 1976, it has someting simular like the SARS? and what do you think about it?