Figure 9.
Presence of antigen I/II (AgI/II) participates in S. suis serotype 9 systemic virulence and blood persistence following intravenous inoculation. Survival (A) and blood bacterial burden 24 h post-infection (B) of C57BL/6 mice following intravenous inoculation of the S. suis serotype 9 wild-type, AgI/II-deficient mutant (ΔagI/II) or complemented (CΔagI/II) strain. Data represent the survival curves (A) or geometric mean (B) of 10 mice/group. *p < 0.01 indicates a significant difference between survival or blood bacterial burden of mice infected with the wild-type strain and ΔagI/II mutant.