The authors state that a retrospective cohort study was used to investigate the outbreak. a). Explain what a retrospective

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Part C

Question 2

The authors state that a retrospective cohort study was used to investigate the outbreak.

  1. Explain what a retrospective cohort study is. (1 mark)
  2. What was the case definition for a confirmed case? (1 mark)
  3. Explain how routine (passive) surveillance and active surveillance (or active case finding) contributed to this investigation (1 mark)
  4. Explain what "attack rate" and "relative risk" mean and how these led to identifying fried ice cream as the source of this outbreak (1 mark)

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