Epidemic, Endemic, Pandemic: What are the Differences?
https://www.publichealth.columbia.edu/news/epidemic-endemic-pandemic-what-are-differences
WEBFeb 19, 2021 · What is a Pandemic? The World Health Organization (WHO) declares a pandemic when a disease’s growth is exponential. This means the growth rate skyrockets, and each day cases grow more than the day prior. In being declared a pandemic, the virus has nothing to do with virology, population immunity, or disease severity.
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