<prompt> Pedzisa mutsara unotevera: John Snow 15 March 1813 16 June 1858 aiva chiremba wokuEngland uye mutungamiri mukukudziridzwa kweanesthesia uye utsanana hwezvokurapa. Anoonekwa somumwe wevakavamba epidemiology yemazuva ano, muchidimbu pamusana pebasa rake rokutsvaka kwakabva hosha.  <response>: denda recholera muSoho, London, muna 1854, iro iye akaderedza nokubvisa mubato wepombi yemvura. Zvakawanikwa naSnow zvakaita kuti vanhu vatange kushandisa mushonga unonyaradza marwadzo, uyewo zvakaita kuti zvinhu zvichinje chaizvo mumvura nemarara muLondon, izvo zvakaita kuti zvimwe zvinhu zvichinjewo mune mamwe maguta, uye zvakabatsira kuti vanhu vave noutano hwakanaka pasi rose. 