Fig. 1.

The lowest pH that C. jejuni NCTC 11168 is able to survive is 3.5. Motile C. jejuni was grown to exponential phase and incubated for 10 and 30 min in Brucella broth adjusted to pH 2.0–7.0. C. jejuni was incubated with non-adjusted Brucella broth as a control. Survival was assessed by cfu after 10 min (solid bars) and 30 min (white bars). Results were expressed as a percentage of surviving bacteria relative to the control. Error bars denote standard error of the mean, and the results shown are the average of three independent experiments.