Rubuta ci gaba ga wannan sakin layi - Broad Street ya kasance sananne ne a matsayin cibiyar cutar ta 1854
na cutar kwalara. Dr. John Snow ya gano barkewar cutar zuwa wani fanfon ruwa na jama'a a kan titi, kuma ya kashe fanfon. Kafin wannan lokacin, an yi tunanin cewa cutar ta haifar da'miasma' da ke cikin iska; binciken Snow ya nuna cewa ruwa ne ke haifar da cutar.