Figure 2.

Measurement of the catalase activity in the Campylobacter jejuni strains before and after exposure to H₂O₂. Catalase activity in the ΔmfrA strain did not significantly increase upon exposure to H₂O₂. The catalase activity was measured in crude cell extracts using the OxiSelect™ catalase activity assay kit. Different letters indicate statistically significant (P < 0.05) differences. For example, a bar that is highlighted by the letter “a” is significantly different than those highlighted by “b” and “c,” while the same letter indicate comparisons that were not statistically significant. The assay was repeated three times independently and samples were tested in three replicates per experiment. Data are presented as mean ± standard deviation.