1863–1875 cholera pandemic - Wikipedia
https://en.wikipedia.org/wiki/1863%E2%80%931875_cholera_pandemic
How Data Became One of the Most Powerful Tools to Fight an Epidemic - The New York Times
https://www.nytimes.com/interactive/2020/06/10/magazine/covid-data.html
1826 Second cholera pandemic1863 Fourth cholera pandemic1918 Spanish flu pandemic2019 Covid-19 pandemic, originating in Wuhan, ChinaArticles in the New York TimesCholeraEpidemiologyGoogle Flu TrendsJohn SnowLondonOutbreaks, epidemics and pandemicsThe zoonotic-spillover theory of the origin of SARS-CoV-2Visualizations and visualizing conceptsWilliam FarrZoonotic diseases