h1n1 influenza a virus(swine flu) and h1n1 influenza a(swine flu)

about h1n1 influenza a(swine flu) , h5n1 influenza a ，know more about influenza a and History of H1N1 Influenza A virus.

How rapid is the onset of swine flu (h1n1) symptoms?

How rapid is the onset of swine flu (h1n1) symptoms?how long after your first symptom appears (i.e. sore throat, headache, etc.) does it take for you to come down with the full-blown flu?
it is very fast

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