Later, by day 14 of infection (Figs 8A and S14), ~21% of cells containing mScarlet+ bacteria were polymorphonuclear Ly6G+ neutrophils, often harboring multiple intracellular Bp PT− bacteria (Figs 8C, see S16 for more images), while a larger fraction (~45%) of mScarlet+Bp PT− bacteria were associated with CD19+MHC-II+ B cells (Fig 8A) located in the B (B220+) cell zone on mLN cryosections by day 14 of infection (cf. Figs 4A, 8C, S9 and S10). This evidence concerns the gene CD19 and infection.