How long does it take for h1n1 symptoms to show?

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  1. #cough
  2. #prior
  3. #onset
  4. #period
  5. #swine
  6. #person
  7. #average
  8. #symptoms
  9. #lasts
  10. #exposure
  11. #fever
  12. #viruses
  13. #after
  14. #contagious
  15. #incubation