how did john snow decrease deaths from cholera
John Snow John Snow (15 March 1813 â€“ 16 June 1858) was an English physician and a leader in the adoption of anaesthesia and medical hygiene. He is considered one of the fathers of modern epidemiology, in part because of his work in tracing the source of a cholera outbreak in Soho, London, in 1854. His findings inspired fundamental changes in the water and waste systems of London, which led to similar changes in other cities, and a significant improvement in general public health around the world.
Black Death in England During the first half of 1349 the Black Death spread northwards. A second front opened up when the plague arrived by ship at the Humber, wherefrom it spread both south and north.[35] In May it reached York, and during the summer months of June, July and August, it ravaged the north.[36] Certain northern counties, like Durham and Cumberland, had been the victim of violent incursions from the Scots, and were therefore left particularly vulnerable to the devastations of the plague.[37] Pestilence is less virulent during the winter months, and spreads less rapidly.[38] The Black Death in England had survived the winter of 1348â€“49, but during the following winter it gave in, and by December 1349 conditions were returning to relative normalcy.[39] It had taken the disease approximately 500 days to traverse the entire country.[40]