FIG 7.

Challenge studies in the BALB/c mouse model and cell adhesion assay. (A) Mortality curve of lethal challenge with S. suis strains. A total of 5 × 10⁷CFU/mouse of each strain was injected intraperitoneally (10 mice per strain) to obtain the survival curve. The groups were observed throughout a 7-day period, and survival condition was recorded every day. (B) A total of 2 × 10⁷ CFU/mice (∼10× LD₅₀) of S. suis CZ130302 was injected intraperitoneally into 50 mice. Five symptomatic mice were euthanized to perform reisolation of S. suis every 24 h by plating 10-fold serial dilutions on THA (**, P < 0.01; *, P < 0.05).