What are the two most common types of epidemiologic studies used to investigate the source of an outbreak

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Question 3: What are the two most common types of epidemiologic studies used to investigate the source of an outbreak (or other public health problem)? Which would you use to investigate the source of the cyclosporiasis outbreak in Texas? Why?
Question 4: Why would you question people who did not become ill about possible sources of infection with Cyclospora?
Question 5: In your own words, interpret the results of the cohort study.
Question 6: What problems in study design or execution should you consider when reviewing the results of this study (or any epidemiologic study)?
Question 7: What additional studies might confirm (or refute) the hypothesis that strawberries were the source of the cyclosporiasis outbreaks?
Question 8: You are writing a newspaper article about the cyclosporiasis outbreaks in Texas and
Ontario. It is thought that the cyclosporiasis problem is ongoing. Four people are available for interview: the CDC expert on cyclosporiasis, one of the Canadian businessmen who became ill following the meeting in Houston, the owner of the private club in Houston where the first outbreak occurred, and the attorney for the California Strawberry Grower’s Association. Your deadline is looming. You have time to ask each of these people only three questions. What would you ask them?
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