Images

Photomicrographs from a Mallard Duck (Anas platyrhynchos) found dead in Missouri, U.S.A. (A) The glomerular mesangium (asterisk) is expanded by amorphous, eosinophilic, acellular material. H&E stain. (B) Tubules in medullary cones are often surrounded by amorphous, eosinophilic, acellular material. H&E stain.

Photomicrographs from an eastern massasauga rattlesnake (Sistrurus catenatus) from Wisconsin, U.S.A. Periodic acid-Shiff. (A) On the ventral neck are multifocal areas of superficial to mid-epidermal necrosis (arrows). (B) Areas of necrosis often contain ~5-µm diameter branching, septate, PAS-positive fungal hyphae (arrowheads).

Photographs from an eastern massasauga rattlesnake (Sistrurus catenatus) found lethargic in Wisconsin, U.S.A. (A) There is a 15 x 12 mm area with firm, misshapen, and discolored scales (arrows) on the ventral neck. (B) There is a 10 x 6 focal area of depression with tan to dark red scale discoloration (arrow) on the ventral body.

Photomicrograph from a boulder brain coral (Colpophyllia natans) found diseased in Biscayne Bay, FL, US. There is lytic necrosis of the gastrodermis extending through the surface body wall (asterisk), and mucocyte hyperplasia with loss of gastrodermis from surface and basal body walls (black arrowheads.

Photographs from a colony of boulder brain coral (Colpophyllia natans) found losing tissue in Biscayne Bay, Miami, FL, US. (A). In situ photograph. An area of prior tissue loss is covered in algal overgrowth (O), new loss is evidenced by white, bare skeleton not yet overgrown by algae (S), and intact healthy-appearing tissue is greenish brown (H).

Photomicrograph from a boulder brain coral (Colpophyllia natans) found diseased in Biscayne Bay, FL, US. Within the basal body wall are necrotic “ghost” dinoflagellate endosymbionts with pale eosinophilic cytoplasm, lysis of nucleus, and loss of spherical shape (arrowheads). Normal endosymbionts are circled.

Photomicrograph from a boulder brain coral (Colpophyllia natans) found diseased in Biscayne Bay, FL, US. There is multifocal lytic necrosis of the gastrodermis extending through the surface and basal body walls (asterisks), and mucocyte hyperplasia with loss of gastrodermis from surface and basal body walls (black arrowheads).

Image from a Timber Wolf (Canis lupus) found dead in Northern Wisconsin, USA. A focus of bony proliferation is seen on a radiograph of the left proximal radius (arrow).

Image from a Timber Wolf (Canis lupus) found dead in Northern Wisconsin, USA. Ulceration of the mucosa of the distal esophagus (arrows). A plastic bag was extracted from where it was tightly lodged in the cardia of the stomach.

Image from a Timber Wolf (Canis lupus) found dead in Northern Wisconsin, USA. There are multiple areas of lysis of bone in the atlas (arrows).

Image from a Timber Wolf (Canis lupus) found dead in Northern Wisconsin, USA. Multiple 8-20 micron, extracellular, round yeasts, some exhibiting broad-based budding, are present in necrotic debris within an area of osteomyelitis in the atlas (arrow) (markedly autolyzed tissue). Grocott’s Methenamine Silver (GMS) stain.

Photomicrographs from a Common Grackle (Quiscalus quiscula) found dead in Ohio, U.S.A. H&E stains. (A) Longitudinal (arrow) and cross sections (arrowheads) of microfilariae in a pulmonary blood vessel. (B) Microfilariae (arrows) within a parabronchus. (C) Microfilaria (arrow) within the cerebellar parenchyma with no associated inflammation.

Photomicrographs from a Fisher (Pekania pennanti) found dead in Wisconsin, USA. (A) Blood vessels in the brain are surrounded by low numbers of lymphocytes and plasma cells (arrows). H&E stain. (B) A blood vessel in the brain is surrounded by low numbers of lymphocytes and plasma cells (black arrow).

Photographs from a Bald Eagle (Haliaeetus leucocephalus) with highly pathogenic avian influenza found dead in Wisconsin, USA.  (A) The pancreas is reddened and has pinpoint to coalescing tan foci of necrosis (arrows). (B) The spleen contains pinpoint tan foci (arrows). 

Photomicrographs from a Bald Eagle (Haliaeetus leucocephalus) with highly pathogenic avian influenza found dead in Wisconsin, USA.  (A) In the brain, there is a region in the cerebrum with small perivascular cuffs of mononuclear cells and rare heterophils (arrow), scattered foci of gliosis (*), and rare acutely necrotic neurons (inset).

Photographs and photomicrographs from a Great-horned Owl (Bubo virginianus) found dead in Arizona, USA. (A) Caseous material is present on the surface of the pharynx (arrows). (B) Multiple small tan foci are present in the liver, which is pale and moderately enlarged. (C) A focus of acute lytic necrosis in the liver (arrows). H&E stain.

Photographs and photomicrographs from a Common Raccoon (Procyon lotor) found dead in a prairie in Wisconsin, USA. (A) There is abrupt segmental reddening of the serosa of the distal jejunum and proximal ileum (arrows). (B) The mucosa of an affected area of the distal jejunum is reddened and bloody (C).

Photographs from a Canada Goose (Branta canadensis) found dead in Wisconsin, USA. A) There was an impaction within the esophagus just proximal to the clavicles (arrows). A hole in the esophagus was caused during dissection. The bird was emaciated, with severe loss of the pectoral skeletal muscles and prominent keel bone (*).

Photomicrographs from a Canada Goose (Branta canadensis) found dead in Wisconsin, USA. A) Unaffected esophagus proximal to the impaction showing normal wall layers of the mucosa (M), submucosa (SM), tunica muscularis (TM), and serosa (S), and the presence of submucosal glands (*).

Distribution of Highly Pathogenic Avian Influenza H5 and H5N1 in North America, in Relation to U.S. Fish & Wildlife Service Refuges and National Park Service Lands, 2021/2022. Updated November 27, 2022.

Distribution of Highly Pathogenic Avian Influenza H5 and H5N1 in North America, in Relation to Tribal Lands in the United States, 2021/2022. Updated November 27, 2022.