Dynamics of M. hyopneumoniae mixed infections in fattening pigs. Prevalence of M. hyopneumoniae mixed infections (i.e. showing multiple VNTR genotypes) in positive pigs at T0 (light bars) and T1 (dark bars) per experimental group. Error bars indicate 95% Confidence Intervals. Asterisks indicate significance level at padj < 0.001 in t-tests on differences of least squares means.