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Infection and immunity
Infection and immunity

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Described image
Figure 7  (a) A redrawn portion of John Snow’s map of the spread of cholera in Soho, London, in 1854. The blue bars represent the number of fatal cases in each household. (b) A replica of the Broad Street pump in modern-day Broadwick Street, with the John Snow public house in the background.

  John Snow, cholera and the Broad Street pump