A, B The number of G-cells (A) and D-cells (B) present in the pyloric gland zone of
-negative (−) and
-positive (+) pigs of different ages. Data are shown as the average number of G-positive and D-positive cells of each age group with standard deviation. Statistical differences were calculated using the non-parametric Kruskal–Wallis H test. * Significant differences between the H. suis-negative and H. suis-positive pigs (p < 0.01); HPF, high power field.