<prompt> Qedela umusho olandelayo: I-Broad Street yayidume kabi ngokuba yisikhungo se-  <response>: Ukuqubuka kwekholera ngo-1854. UDkt. uJohn Snow walandelisa ukuqubuka kwalesi sifo empompini yamanzi yomphakathi esemgwaqweni, futhi wayikhubaza. Ngaphambi kwalesi sikhathi, kwakucatshangwa kabanzi ukuthi lesi sifo sasibangelwa i-miasma edluliselwa ngomoya; okutholakele kukaSnow kwabonisa ukuthi sidluliselwa ngamanzi. 