<prompt> Nyorai kupfuurira kweiyi ndima - Broad Street yakanga ine mukurumbira wakashata senzvimbo yekuputika kwa 1854  <response>: yekorera. Dr. John Snow vakatevera kupararira kwechirwere ichi kusvika papombi yemvura yomunharaunda iri mumugwagwa, uye vakaidzima. Nguva iyi isati yasvika, chirwere chacho chaifungidzirwa zvikuru kuti chinokonzerwa nemiasma inofambiswa nemhepo; zvakawanikwa naSnow zvakaratidza kuti chinoparadzirwa nemvura. 