FIGURE 19-3.

A, Histopathology of the jejunum from a kitten with panleukopenia. Villi are rounded and blunted with nearly complete epithelial loss and crypt dilation. H&E stain. B, Histopathology of the jejunum from a young barn cat that died after several days of profound weakness and neurologic signs. Six other cats in the barn died with the same signs. Mucosal crypts are dilated and contain debris, and intranuclear inclusions are present (small arrows). Another cell (large arrow) is foamy and degenerate and has a hyperchromatic nucleus. H&E stain. C, Same cat as in B. The presence of FPV in the intestinal tract is confirmed with immunohistochemistry (brown stain).

(Courtesy Dr. Patricia Pesavento, University of California, Davis Veterinary Anatomic Pathology Service.)