<prompt> Bhala okuqhubekayo kwalesi sigaba - Umsebenzi kaJohn Snow uyaphawuleka ngokusiza ekuxhumaniseni phakathi kwesifo sekholera nesifo sofuba nemithombo yamanzi engcolisiwe, okwaba nengxenye ekubhujisweni komqondo we-miasma. Phakathi nobhadane lwekholera ngo-1854  <response>: I-Snow yathola ukuthi izinga eliphezulu lokufa kwezakhamuzi zaseSoho livela 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 