National Wildlife Health Center

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Search here for some of our available field imagery and videos.

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Map of North America showing locations where chronic wasting disease has been detected.
November 12, 2020

Distribution of Chronic Wasting Disease in North America

Distribution of Chronic Wasting Disease in North America, updated November 12, 2020.

Histology panel from eastern gray squirrel
September 22, 2020

Histology panel from eastern gray squirrel

Photomicrographs from the lung of an eastern gray squirrel (Sciurus carolinensis) found dead in Wisconsin, U.S.A. (A) A bronchiole (arrow) contains numerous neutrophils. H&E stain. Inset: Bronchiolar epithelium is overlain by Gram-negative bacteria. Brown and Hopps stain. Bar = 20 µm. (B) Approximately 30% of the pulmonary parenchyma is replaced by dense

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Necropsy photos from eastern gray squirrel
September 10, 2020

Necropsy photos from eastern gray squirrel

Photographs from an eastern gray squirrel (Sciurus carolinensis) found dead in Wisconsin, U.S.A.  (A) The lung contained multifocal firm red areas (arrows) and multifocal areas of hemorrhage (arrowhead). (B) Firm areas are red to tan on cut section and airways contain mucoid red to tan fluid.

Photomicrographs from a desert cottontail showing changes due to RHDV2.
August 24, 2020

Photomicrographs from a desert cottontail found dead in Texas

Photomicrographs from a desert cottontail found dead in Texas, U.S.A. showing (A) panlobular hepatocellular dissociation and necrosis and (B) intra-alveolar edema fluid (asterisk) and foamy pulmonary macrophages (arrows) in the lung.

Microscopic view of organs of mountain cottontail rabbit.
August 19, 2020

Photographs from organs of a mountain cottontail rabbit found dead

Photographs from an adult female mountain cottontail rabbit (Sylvilagus nuttallii) found dead in Montana, U.S.A. (A) Liver with random foci of necrosis (asterisk) characterized by accumulation of cellular detritus intermingled with fibrin and colonies of small coccoid bacteria (inset). H&E stain. (B) The spleen exhibits multifocal confluent areas of necrosis (

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Photographs of tissues samples from mallard duck intestine next to ruler for scale.
July 24, 2020

Photographs of intestine tissue from mallard ducks with trematodiasis

Photographs from two mallards (Anas platyrhynchos) found dead within a warm-water retention pond in Minnesota, US. (A) Caeca with mucosal roughening and caseous plaque formation. A larger trematode (arrow) is found within. (B) Dilated and thinned intestine containing watery intestinal content with pinpoint white material.

Photographs from mallard ducks showing trematodes in tissue.
July 24, 2020

Photographs from two mallards (Anas platyrhynchos) with trematodiasis

Photographs from two mallards (Anas platyrhynchos) found dead within a warm-water retention pond in Minnesota, US. (A) Jejunum with superficial pseudomembranes and deep mucosal granulomatous inflammation (clear arrow). Small degenerated metazoan parasites are present rarely within the inflamed areas (black arrow). H&E stain. (B). Cecum with approximately 50 x

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Photographs of a common eider liver and pancreas.
June 3, 2020

Photographs from a Common Eider (Somateria mollissima)

Photographs from a Common Eider (Somateria mollissima) from Massachusetts, USA. (A) There are scattered, small, pale foci in the liver. (B) Petechial and ecchymotic hemorrhages are present in the pancreas.

Photomicrographs from a Common Eider showing necrosis.
June 3, 2020

Photomicrographs from a Common Eider (Somateria mollissima)

Photomicrographs from a Common Eider (Somateria mollissima) from Massachusetts, USA. (A) Multiple pale foci of acute hepatic necrosis. (B) Multiple foci of acute pancreatic necrosis (arrow).

Undersides of two frogs one of which shows organs  inside abdomen.
February 5, 2020

Images from necropsy of two foothill yellow-legged frogs (Rana boylii)

Two foothill yellow-legged frogs (Rana boylii) found dead in Santa Clara, California, USA. (A) One animal had pinpoint red foci on the ventral abdomen. (B) Another animal had a diffusely reddened kidney (arrow).

Photomicropgraphs with arrows showing location of lesions.
February 5, 2020

Photomicrographs from a foothill yellow-legged frog (Rana boylii)

Photomicrographs from a foothill yellow-legged frog (Rana boylii) found dead in Santa Clara, California, USA. (A) Small areas of epidermal necrosis with apoptotic keratinocytes and nuclear debris are multifocally present (arrow). (B) The liver shows randomly distributed, variably sized areas of coagulative necrosis (*). A few adjacent hepatocytes have

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Photograph of a muskrat liver with pinpoint white and red foci.
January 23, 2020

Photograph from a muskrat (Ondatra zibethicus) found dead in Ohio, USA

Photograph from a muskrat (Ondatra zibethicus) found dead in Ohio, USA. The liver contained disseminated pinpoint to 1-mm diameter white foci (arrows). Tyzzer's disease.