Figure 5

Discriminant analysis of principal components applied to clinical strains of H. parasuis by disease categories. 80% eigenvalues were retained for the PCA and all eigenvalues were retained for the discriminant analysis. Plots a and b show the first axis of the discriminant function while c, d, e and f show the first two axes. Separation along the axes suggests that genetic differences are present between the phenotypic groups of clinical and non-clinical isolates that are being compared; however the presence of overlap shows that some strains are intermediates. Plots c and d show that geographic origin, do not show much separation of the isolates by geography, those that have separated are only represented by a couple of isolates. On the other hand, the discriminant function based on the BAPS populations shows a lot of separation and so the population structure does have an influence on these isolates genetic content.