Comparison of the number of
bacteria in the fundic and pyloric gland zone of pigs of different ages. Data are shown as log10 values of the number H. suis bacteria per mg tissue. Pigs in which no H. suis infection was detected, were set as 0. Individual pigs are shown as figures around the mean (lines). Statistical differences were calculated using the non-parametric Kruskal–Wallis H test. *p < 0.05; **p < 0.001 significant differences between the H. suis-positive age groups.