The increase was much greater between 27.5 (Growth2) and 30 wk (Growth3) than between 25 (Growth1) and 27.5 wk (Growth2; 4 to 5 points vs. 1 to 2 points) except for the least decontamination
efficacy for which shedding prevalences were very close (see on Figure 4 for significant differences;P < 0.05).