<prompt> Qedela umusho olandelayo: Umsebenzi kaJohn Snow uyaphawuleka ngokusiza ekuxhumaniseni izifo eziwumshayabhuqe zekholera ne-typhoid nemithombo yamanzi engcolisiwe, okwaba nengxenye ekubhujisweni komqondo we-miasma. Phakathi nenkathi  <response>: Umqedazwe wekholera ka-1854, uSnow wathola ukuthi izinga eliphezulu lokufa kwezakhamuzi zaseSoho lalivela empompini yamanzi eseBroad Street. USnow wancenga uhulumeni wendawo ukuba asuse isibambo sepompo, okwaholela ekwehleni okuphawulekayo kwamacala ekholera kuleyo ndawo. Ngo-1857, uSnow wafaka iphepha kuyi-British Medical Journal elalibhekisela enanini eliphakeme lamacala ekholera emithonjeni yamanzi eyayingcoliswe indle yabantu. USnow wasebenzisa imininingwane yezibalo ukuze abonise ukuthi izakhamuzi ezazithola amanzi emithonjeni esezansi zazinamathuba amancane kakhulu okuthola ikholera kunalezo ezazithola amanzi emithonjeni esezansi. Nakuba ucwaningo lwakhe lwasekela umbono wakhe wokuthi amanzi angcolile, hhayi umoya ongcolile, ayewumthombo wekholera 