But he didn't just produce a map it was one part of a detailed statistical analysis.Īs the Public Health Perspectives blog says, it changed how we see data visualisations, and how we see microbes. It turned out that the water for the pump was polluted by sewage from a nearby cesspit where a baby's nappy contaminated with cholera had been dumped. In nearby Poland street, a workhouse was surrounded by cases but appeared unaffected: this was because, again, it had its own water supply. But it had its own water supply too and there were consequently fewer cases. She was seized with cholera on the evening of the latter day, and died on SaturdayĪt a local brewery, the workers were allowed all the beer they could drink - it was believed they didn't drink water at all. The water was taken on Thursday 31st August., and she drank of it in the evening, and also on Friday. A cart went from broad Street to West End every day and it was the custom to take out a large bottle of the water from the pump in Broad Street, as she preferred it. I was informed by this lady's son that she had not been in the neighbourhood of Broad Street for many months. One 59-year-old woman sent daily for water from the Broad street pump because she liked its taste. In some of the instance, where the deaths are scattered a little further from the rest on the map, the malady was probably contracted at a nearer point to the pump
There were some outliers though and Snow wrote that: It became apparent that the cases were clustered around the pump in Broad (now Broadwick) street. And data journalist? Photograph: Centre for Sexual & Reproductive Health
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