Cika wannan jumla:
1854 Cutar cutar kwalara ta Broad Street wata mummunar cutar kwalara ce da ta faru a shekara ta 1854 kusa da Broad Street (yanzu Broadwick Street) a gundumar Soho na London, Ingila, kuma ta faru ne a lokacin annobar kwalara ta uku. Wannan barkewar cutar, wacce ta kashe mutane 616, an fi saninta da binciken likitan John Snow game da abubuwan da ke haifar da shi da kuma tunaninsa cewa ruwa mai gurɓataccen kwayar cuta shine tushen kwalara, maimakon barbashi a cikin iska (wanda ake kira "miasma").