Photomicrographs from an eastern gray squirrel (Sciurus carolinensis) found dead in Wisconsin

Photomicrographs from an eastern gray squirrel (Sciurus carolinensis) found dead in Wisconsin, U.S.  (A) On low magnification, the cerebrum exhibits areas of hypercellularity (arrows). H&E stain.  (B) Detail of A: There is mild lymphoplasmacytic perivascular cuffing (arrowhead) and areas of gliosis (arrow) within the cerebrum. H&E stain.  (C) Clusters of neutrophils (arrow) are occasionally present within the neuropil. H&E stain.  (D) The atrium of the heart contains moderate numbers of mononuclear cells. H&E stain.