TABLE 2.

Longest recorded lengths of time until zoonotic agents could no longer be isolated from the surface of grass pasture sampled as described in Materials and Methods^a

Waste type	Longest recorded time (days) for:
	Salmonellae	E. coli O157	L. monocytogenes	C. jejuni	C. parvum
Dairy cattle FYM	42	16	128	42	30
Dairy cattle slurry	63	32	42	63	30
Beef cattle FYMb	63	32	63	63	30
Beef cattle slurryb	32	32	63	32	30
Pig FYM	32	32	63	32	30
Pig Slurry	16	32	63	16	63
Poultry FYM	63	32	42	42	30
Sheep FYM	16	63	128	16	30
Dirty water	42	32	128	32	30

^aZoonotic agents were introduced into livestock wastes which were subsequently spread onto grassland without incorporation. The majority of the data are the longest times observed for any of the three decline experiments which were performed separately during two summers and a single winter season.

^bData were obtained from summer decline experiments only.