<prompt> Pedzisa mutsara unotevera: MuLondon muna June 1866, denda rakapararira muEast End rakauraya vanhu 5.596, apo guta racho rakanga richipedzisa kuvakwa kwenzvimbo dzaro huru dzokuchenesa tsvina nemvura ona London sewerage system; chikamu cheEast End chakanga chisina kunyatsopera. Nyanzvi yezvirwere William Farr akataura kuti East London Water Company ndiyo yakanga yaita kuti chirwere chacho chipararire. Farr akashandisa basa rapfuura raJohn Snow navamwe vachiratidza mvura yokunwa yakashatiswa sechikonzero chinobvira checholera mune imwe nharaunda.  <response>: Kupararira muna 1854. Kuita nokukurumidza kwakadzivisa kufazve. Mugore rimwe chetero, kushandiswa kwemvura yemumigero yakasvibiswa mumabasa emvura omunzvimbomo kwakaparira kupararira kuduku paYstalyfera muSouth Wales. Vashandi vaibatanidzwa nekambani nemhuri dzavo ndivo vakanyanya kutapurwa, uye 119 vakafa. 