FIG. 7.

General patterns of inflammation. Meninxitis was frequently composed of granulocytes associated with free spores (arrows). In grade 3 meninxitis, inflammation appeared both ventral (black arrow) and dorsal (white arrow) to the spinal cord. In severe cases, inflammation frequently extended through the ectomeninx to cause periradiculoneuritis (white arrow). In this image, grade 2 myelitis is observed with generalized gliosis (star), neuronophagia (white arrowhead) and piecemeal neuronal necrosis with peripheral vacuolation (black arrowhead). H&E. Scale bar=50 μM.