Figure 2. Stationary-phase, inducible-acid-tolerant E. coli O157:H7 challenged in EG medium (pH 2.5) with (I, induced) or without (NI, non-induced) 2 mM glutamate.

Experimental samples were exposed to a 1% CB suspension for 2 h. Data are presented as the mean ±SD for three independent experiments. The dotted line represents the limit of detection.