TABLE 2.

Growth of protozoa in cocultures with food-borne pathogenic bacteria and changes in numbers of cells over 24 h

Protozoan	Food-borne pathogen	No. of protozoan cells/ml		% Increase in 24 h
		Initial	Final
G. scintillans	E. coli O157:H7	2.5 × 103	8.6 × 103	244
	S. enterica	2.6 × 103	5.5 × 103	111
	Listeria	2.0 × 103	4.4 × 103	120
	Control	2.5 × 103	2.5 × 103	0
C. steinii	E. coli O157:H7	4.3 × 103	3.0 × 104	579
	S. enterica	4.3 × 103	3.6 × 104	837
	Listeria	4.3 × 103	3.5 × 104	713
	Control	4.3 × 103	5.7 × 102	−86
A. palestinensis	E. coli O157:H7	4.14 × 103	4.2 × 104	914
	S. enterica	4.14 × 103	4.6 × 104	1,011
	Listeria	4.14 × 103	5.2 × 104	1,156
	Control	4.14 × 103	2.0 ×102	−95
T. pyriformis	E. coli O157:H7	2.9 × 103	2.7 × 104	1,025
	S. enterica	2.9 × 103	3.7 × 104	1,175
	Listeria	2.9 × 103	5.9 × 104	1,934
	Control	2.9 × 103	3.2 × 103	10
Tetrahymena sp. strain MB125	E. coli O157:H7	4.9 × 103	3.9 × 104	1,256
	Control	4.9 × 103	6.0 × 103	22