Table 3.

Percent recovery of Salmonella on day 0 and after 6 months of storage at −80°C, expressed as percent of replicates testing positive for Salmonella

Starting concn in frozen sample (CFU/ml)	% recovery
	Cattle fecal background				Soil background				Water background
	S. Poona		S. Infantis		S. Poona		S. Infantis		S. Poona		S. Infantis
	Day 0	6 mo	Day 0	6 mo	Day 0	6 mo	Day 0	6 mo	Day 0	6 mo	Day 0	6 mo
1.8 × 106	100	100	100	100	100	100	100	100	100	100	100	100
1.8 × 104	100	100	100	100	100	100	100	100	100	100	100	100
1.8 × 102	66	66	66	100	100	100	66	66	66	100	100	66
1.8 × 100	0	0	0	33	33	0	0	33	0	66	66	0
0	0	0	0	0	0	0	0	0	0	0	0	0