CD86 and infection: In contrast, at 25 days p.i., a high frequency of lung CD11c+ cells from B. pertussis-infected mice continued to express CD86, MHC class II, and CD11b (4.87-, 3.36- and 3.48-fold over controls respectively) while comparable cells from B. parapertussis and BpΔPTX infections decreased to corresponding percentages of cells from uninfected mice (Fig. 5D).