Correlation of hypothetical virulence traits of two Streptococcus uberis strains with the clinical manifestation of bovine mastitis

Table 1 Overview of potential virulence characteristics of Streptococcus uberis and their in vitro manifestation in FSL Z1-048 and FSL Z1-124, which were virulent and non-virulent, respectively, in experimental challenge studies [36]

Virulence trait	FSL Z1-048	FSL Z1-124
Growth in milk^a	↓^b	↑
Resistance to macrophage killing	↑	↓
Resistance to PMN killing	↓	↑
Adhesion	↑	↓
Invasion	↓	↑
Biofilm formation	↓	↑
Sua	↓	↑

^aBased on Tassi et al. [36]
^b↑ Means that the trait as observed in vitro would be expected to increase virulence in vivo compared to the other strain and ↓ means that the trait as observed in vitro would be expected to decrease virulence in vivo.

ISSN: 1297-9716