IL-17A–producing γδ Trm cells cluster at L. monocytogenes replication foci with myeloid cell granulomas. Sections of MLN from L. monocytogenes-immune (memory) (A, Left) or 1 dpr mice (A, Right) were immunostained for listeriolysin-O (LLO) (L. monocytogenes) or the indicated surface proteins or IL-17A (B). [Scale bars, 100 (A) and 50 (B) μm.] B, B-cell zone; IFA, interfollicular area; M, medulla; and T, T-cell zone.