<prompt> Pedzisa mutsara unotevera: Nzvimbo iyi inozivikanwa nokuda kwekorera  <response>: Kupararira kwedenda muna 1854 kwakatungamirira kukushandiswa kwokutanga kwenheyo dzinokosha dzezvirwere kuti kugadzirise dambudziko racho. John Snow, chiremba uyo akaziva kuti vanhu vacho vakanga vakaungana pedyo nepombi iri paBroad Street akataura zvaakawana pamepu. Kwakaita kuti pombi ivharwe uye kuderera kwezviitiko zvecholera kwakanga kuri kukurumidza. 