S. suis induces elevated levels of IL-1β in liver and spleen but not in plasma. C57BL/6 mice were intraperitoneally inoculated with the S. suis strain P1/7 (white bars) or SC84 (gray bars). Plasma (A, B), spleen (C, D) and liver (E, F) were collected at different times post-infection and levels of IL-1β were quantified by ELISA. Values for mock-infected controls did not change between 6 and 48 h. As such, 0 h represents results for mock-infected mice throughout the experiment. Data are expressed as mean ± SEM (n = 3).