TNFSF11 and infection: For its part, RANKL was significantly overexpressed in response to the 3 bacteria studied compared to the non-infected condition, serotype a (p = 0.0015), b (p = 0.0028), and c (p = 0.0154) at 2 h of infection and serotype a (p < 0.0001), b (p = 0.0002), and c (p < 0.0001) at 24 h of infection.