TABLE 1.

Inhibition of entry of L. monocytogenes into epithelial cell lines by conditioned Kato III medium

Cells and culture conditions	Avg no. of intracellular bacteria/cella	% Cells infected (range over replicates)a	Relative infection (%)b
Caco-2
Standard conditions	5.34 ± 1.26	41-66	100
Kato III conditioned plus RPMI 1640 medium	1.18 ± 0.46	7-16	22
RPMI 1640 medium alone	4.58 ± 0.35	35-65	92
AGS
Standard conditions	0.35 ± 0.18	1.8-5.4	100
Kato III conditioned plus RPMI 1640 medium	0.06 ± 0.03	0.3-0.9	17
RPMI 1640 alone	0.26 ± 0.04	1.3-5.0	83

^aDetermined from a minimum of nine replicate experiments.

^bThat is, with respect to standard conditions.