A: Representative H&E-stained kidney sections collected from uninfected (A1, A3) or S. aureus-infected (A2, A4) C57BL/6 (A1, A2) or A/J (A3, A4) mice at 24 hours of infection with S. aureus. Glomeruli are indicated by G, blood vessels by BV, and bacteria by a white asterisk. B: Levels of urea in serum of infected or uninfected C57BL/6 (black bars) or A/J (white bars) mice at 24 hours of infection with S. aureus. *P < 0.05, by F-test. Original magnifications, × 200.