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microbiology; epidemiology
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epidemiology
where and when diseases occur and how transmitted
epidemiologists
determine etiology, identify important factors concerning spread, develop methods for control, assemble data and graphs to outline incidence
john snow
1848; mapped occurrence of cholera in London
ignaz semmelweis
1847; showed that handwashing decreased incidence of peurperal sepsis (childbed fever)
florence nightingale
1858; showed that improved sanitation decreased incidence of epidemic typhus