Reference
Principles of Epidemiology
Principles of Epidemiology. (n.d.). United States Center for Disease Control. Retrieved July 19, 2020, from https://www.cdc.gov/csels/dsepd/ss1978/lesson6/section2.html
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Updated 2021-11-15
Tags
SARS-CoV-2 (COVID-19)
Biomedical Sciences