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[Comment] Taking aim at cholera

In 1854, John Snow’s work on cholera in London immortalised the power of mapping as a tool for disease prevention and control.1 Over 160 years later, a more ambitious effort to map cholera has been reported in The Lancet.2 Forgoing so-called shoe leather epidemiology in favour of big data, Justin Lessler and colleagues2 used 279 cholera datasets covering 2283 locations in 37 countries, and cluster-level maps of access to improved water and sanitation in 41 countries, to map cholera incidence across sub-Saharan Africa at a 20 km × 20 km grid scale.

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