Uncleanliness, decaying refuse, dampness, and mold promote disease and epidemics.

Original passage

Every form of uncleanliness tends to disease. Death-producing germs abound in dark, neglected corners, in decaying refuse, in dampness and mold and must. No waste vegetables or heaps of fallen leaves should be allowed to remain near the house to decay and poison the air. Nothing unclean or decaying should be tolerated within the home. In towns or cities regarded perfectly healthful, many an epidemic of fever has been traced to decaying matter about the dwelling of some careless householder.