Histopathology of infected brain sections. (A, B) Coronal sections of brain with sub-arachnoid meningeal inflammation (arrowheads). Macrophages are the predominant cellular infiltrate in these fields. Thrombosed sub-arachnoid vessels are marked with arrows. H&E; mag, 100×. (C) Area of ventriculitis seen in the brain of mouse #6. H&E; mag, 200×.