Immunocompetent (IC) or FK506-treated (5 mg/kg/day) C57BL/6 WT mice were infected with AF CEA10 (1 × 107 conidia/mouse) i.n.E PAS-stained lung sections of immunocompetent and FK506-treated animals at 6 h p.i. Scale bar: 50 μm. IC animals showed inflammatory cell infiltrates around conidia (black arrows), whereas in FK506-treated animals, only uptake of conidia by the resident macrophage population could be seen. 