To test the hypothesis on the source of the outbreak, a case-control study was conducted from July 21-27. Thirty-one of the initial 38 persons meeting the original case definition (i.e., those not used in hypothesis-generating interviews) were included as cases. It was decided that two controls would be selected for every case and would be matched to the case by age group (0-<2 years, 2-<5 years, 5-<12 years, 12-<18 years, 18-<60 years, and 60+ years) and gender.
The investigators identified controls for the study using sequential digit dialing. Exposure information among cases was collected for the 7 days before onset of illness. For controls, exposure information was collected for the 7 days before the interview and for the 7 days before the onset of illness in the matching case.
Twenty-seven case-control sets were interviewed; the remaining case-patients could not be reached.
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SLP Assignment Expectations
Length: At least 4 pages (1000 words), APA format, scholarly sources.
Centers for Disease Control and Prevention. (2012). Lesson one: Introduction to epidemiology: Section 6: Descriptive epidemiology. In Principles of Epidemiology in Public Health Practice, 3rd Edition. Retrieved May 1, 2019, from https://www.cdc.gov/csels/dsepd/ss1978/lesson1/section6.html
Centers for Disease Control and Prevention. (2012). Lesson one: Introduction to epidemiology: Section 7: Analytical epidemiology. Principles of Epidemiology in Public Health Practice, 3rd Edition. Retrieved May 1, 2019, from https://www.cdc.gov/csels/dsepd/ss1978/lesson1/section7.html
Coggon, D., Rose, G., & Barker, D. J. P. (2007) Chapter 8: Case-control and cross sectional studies. In Epidemiology for the Uninitiated (4th edition). British Medical Journal. Retrieved on May 22, 2012, from http://www.bmj.com/about-bmj/resources-readers/publications/epidemiology-uninitiated
Herbert, R. (2017). Case-control studies. Journal of Physiotherapy,