<prompt> Nyorai kupfuurira kweiyi ndima - John Snow, piyona weanesthesia, aigara panhamba 18 kubva muna 1852 kusvikira parufu rwake muna 1858. Snow anoonekwa somumwe wevakavamba chirwere chemazuva ano, zvimwe nemhaka yebasa rake rokutsvaka kwaibva kupararira kwekorera muSoho, kuLondon, muna 1854  <response>: . 