<prompt> Qedela le nkulumo elandelayo: Ngalowo nyaka, udokotela waseBrithani uJohn Snow, owayesebenza endaweni empofu yaseLondon, wathi amanzi angcolile ayindlela yokudlulisela lesi sifo. Ngemva  <response>: Ngo-1854 kwaqubuka i-cholera eBroad Street. Wayenze ibalazwe lamacala ekholera endaweni yaseSoho eLondon, futhi waphawula inqwaba yamacala eduze kwepompo yamanzi endaweni eyodwa. Ukuze ahlole umbono wakhe, wancenga izikhulu ukuba zisuse isibambo sepompo, futhi ngokushesha inani labantu ababegula ikholera kuleyo ndawo lehla. Ukugqama kwakhe ekugcineni kwasiza ekulawuleni ubhadane. USnow wayengomunye wabasunguli be-Epidemiological Society of London, eyasungulwa ngenxa yokuqubuka kwekholera ngo-1849, futhi uthathwa njengomunye wobaba be-epidemiology. 