How do I know my widal test is positive?

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  4. #immunized
  5. #malaria
  6. #little
  7. #single
  8. #cross
  9. #including
  10. #clinical
  11. #titer
  12. #reacting
  13. #positive
  14. #infections
  15. #persons
  16. #number
  17. #infection
  18. #active