<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngalowonyaka, udokotela waseBrithani uJohn Snow, owayesebenza endaweni empofu yaseLondon, waveza amanzi angcolile njengendlela yokudlulisela lesi sifo. Ngemva kokuqubuka kwekholera ngo-1854 eBroad Street  <response>: wayenze ibalazwe lamacala ekholera endaweni yaseSoho eLondon, futhi waphawula inqwaba yamacala eduze kwepompo yamanzi endaweni ethile. 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. 