= Principles of Epidemiology in Public Health Practice by the Centers for Disease Control and Prevention
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https://archive.cdc.gov/www_cdc_gov/csels/dsepd/ss1978/lesson1/section11.html
Verified Lesson 1, section 11, Level of disease and Epidemic Patterns: baseline-relative epidemic definition, case curves and common-source versus propagated patterns. The wiki numerical baseline example and SIR calculation are independent illustrations. Institutional source; follows existing CDC cards without a personal-author tag.
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