Fig 4.

C57BL/6 (A) or TLR2-deficient (B) mice were infected intragastrically with 1 × 10⁹ CFU wild-type S. Typhimurium or isogenic csgBA mutant or were mock treated (LB) for 72 h, and 150 μl of 80-mg/ml FITC-dextran was administered intragastrically 4 h prior to sacrifice of animals. Blood was collected, and fluorescence in the serum was measured using a BMG Omega plate reader. Significant statistical differences are indicated (P < 0.05).