<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngokushesha umkhuba wokwelashwa kwamanzi waba umkhuba ovamile, futhi ubuhle baloluhlelo babonakala ngokucacile ngemva kokucwaninga kukadokotela uJohn Snow phakathi nokuqubuka kwekholera ngo-1854 eBroad Street  <response>: . futhi. USnow wayengenalo ukholo emfundisweni ye-miasma eyayivamile ngaleso sikhathi eyayithi izifo zabangelwa umoya omubi onobuthi. Nakuba inkolelo-mbono yokuthi izifo zibangelwa amagciwane yayingakasungulwa, lokho okwakubonwe uSnow kwamholela ekubeni ayilahle inkolelo-mbono eyayivamile. Indatshana yakhe yango-1855 ethi On the Mode of Communication of Cholera yabonisa ngokucacile indima yokunikezwa kwamanzi ekusakazeni ubhubhane lwekholera eSoho, kusetshenziswa imephu yokusabalalisa amachashazi nobufakazi obungokwezibalo ukukhombisa ukuxhumana phakathi kwekhwalithi yomthombo wamanzi namacala ekholera. Imininingwane yakhe yakholisa umkhandlu wendawo ukuba ukhubaze iphampu yamanzi, okwaqeda ngokushesha ukuqubuka kwalesi sifo. 