What condition most contributed to disease spreading in tenements in the early 1900s?

What condition most contributed to disease spreading in tenements in the early 1900s?

The Plaugue

Personal hygiene became a issue because of the lack of running water and the garbage that piled up on the streets, it became difficult for those living in tenements to bathe properly or launder their clothing. This triggered the spread of diseases such as cholera, typhoid, smallpox, and tuberculosis.