Figure 1.

Campylobacter (C.) jejuni colonization of 36 sentinels per group determined by semiquantitative analysis (min to max). (A) C. jejuni counts in log₁₀ most probable number (MPN) in cloacal swabs derived from sentinels confirmed to shed C. jejuni at distinct time points after oral inoculation of the seeders at d 10. Three and four days postinoculation (dpi), 2 (3 dpi) and 3 (4 dpi) sentinels of the control group and 6 (3 dpi) and 21 (4 dpi) sentinels of the experimental group shed C. jejuni. From eight dpi onwards, samples of all 36 sentinels were Campylobacter-positive. (B) C. jejuni counts in log₁₀ MPN per gram in intestinal content of 36 sentinels per group upon necropsy (23 dpi). White dotted boxes represent the control group (broilers challenged with C. jejuni and not treated with a combination of organic acids); gray boxes represent the experimental group challenged with C. jejuni and treated with a combination of organic acids. Medians (bold line) and significance levels (P values) determined by the Mann-Whitney U test are indicated. * (P < 0.05), ** (P < 0.01), *** (P < 0.001).