Figure 2: Genomic differences between non-clinical, systemic and respiratory strains.
From: Genomic signatures of human and animal disease in the zoonotic pathogen Streptococcus suis

Discriminant analysis of principal components, applied to 153 S. suis isolates isolated from pigs in the United Kingdom, using SNPs in the core genome, and presence/absence data for genes in the accessory genome. Isolates were classified as non-clinical (isolated from the nasal passage), systemic (disease-causing and isolated from the brain, blood or joints) or respiratory (disease-causing and isolated from the lungs).