Which of the following statements is incorrect regarding typhoid fever?

  • A
    The pathogenic bacteria cause lesions in the intestinal wall.
  • B
    Typhoid is commonly observed in the elderly.
  • C
    The average incubation period of the pathogenic bacteria is $2$ weeks.
  • D
    High fever persists during the first and second weeks, which gradually decreases in the third and fourth weeks.

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