Histopathology of lung lesions in BALB/c mice.

<p>Pulmonary parenchyma from mice with reactivated infection, sacrificed 3 days after the end of dexamethasone treatment, showing interstitial inflammatory cell infiltrates comprising predominantly mononuclear leukocytes (A). Pulmonary parenchyma from mice at the time of primary infection (B) showing abundant inflammatory infiltrates and focal vasculitis (arrows). Hematoxylin and eosin stain, original magnifications ×200.