<prompt> Ramba uchinyora ndima iyi - Nemhaka yokuti mvura inobva mumapombi emidziyo inotorwa zvakananga muvhu, inowanzotapukirwa. Kana mvura yakadaro ikasacheneswa, kunwa kwainenge ichiita kungaita kuti munhu abatwe nezvirwere zvomudumbu kana kuti zvimwe zvirwere zvinokonzerwa nemvura. Muenzaniso wakakurumbira ndewokupararira kwecholera muBroad Street muna 1854  <response>: . Panguva iyoyo kwakanga kusingazivikanwi kuti korera yaipfuudzwa sei, asi chiremba John Snow akafungidzira mvura yakasvibiswa uye akabvisa mubato wepombi yaifungidzirwa; kuputika kwacho ipapo kwakaderera. 