Listen to a Podcast About Public Health

Examine how populations stay healthy — epidemiology, disease surveillance, pandemic preparedness, health equity, and the policy levers that prevent illness on a massive scale.

John Snow's 1854 investigation of a cholera outbreak in London — where he mapped cases and identified a contaminated water pump on Broad Street — is considered the founding event of modern epidemiology, establishing that disease could be traced to environmental sources. The WHO's Global Health Observatory tracks life expectancy, which has increased from 52 years in 1960 to 73 years in 2023, with the gains driven primarily by improvements in sanitation, nutrition, and vaccination rather than curative medicine. The COVID-19 pandemic, which killed an estimated 7 million people officially (with excess mortality estimates suggesting 15-20 million), exposed critical gaps in pandemic preparedness and prompted a global reassessment of public health infrastructure and surveillance systems.

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