Images

Wildlife Disease Biologist Ariel Mixon organizes samples and completes datasheets on the tailgate of a truck after conducting avian influenza surveillance work through the National Wildlife Disease Program.

Clint Turnge (USDA) releases wood ducks. NWRC Accomplishment Report Photos. In 2016, NWRC's National Wildlife Disease Program sampled more than 21,800 wild birds for highly pathogenic avian influenza (HPAI).

Biological Sciences Laboratory Technician donning protective gear for SARS-CoV-2 testing in the NWHC Diagnostic Virology Laboratory.

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.

Photographs and a radiograph from a Northern sea otter (Enhydra lutris kenyoni) from Oregon, U.S.A. (A) The deceased sea otter on a beach in Oregon, U.S.A.

Photographs from Wild Turkeys (Meleagris gallopavo) found dead in Wisconsin, USA.  (A) The liver contains many multifocal to coalescing bullseye-shaped foci of necrosis (arrows). The ventriculus (*) is labeled for orientation. (B) The paired ceca (*) are ectatic with thickened walls.

Photomicrographs from Wild Turkeys (Meleagris gallopavo) found dead in Wisconsin, USA.  (A) In the liver, hepatocytes were replaced by macrophages, lymphocytes, and plasma cells (lower left) with occasional multinucleated giant cells (arrows). H&E stain.  (B) The cecum contains a fibrinonecrotic membrane effacing the mucosa (arrow).

USGS scientists and partners applied hot water as a control method for invasive corallimorphs at Palmyra Atoll National Wildlife Refuge.

USGS scientists and partners applied a toothpaste-like compound mixed with sodium hydroxide as a control method for invasive corallimorphs at Palmyra Atoll National Wildlife Refuge.

Photographs from red crossbills (Loxia curvirostra; A, C) and American goldfinches (Spinus tristis; B, D) from Montana, U.S.A. (A) A large yellow/tan plaque (asterisk) is present on the mucosal surface of the crop. (B) White seed-like plaques (arrow) are present on the mucosal surface of the crop.

Photomicrographs from a California newt (Taricha torosa) found moribund in California, USA. (A) Necrosis of the tail tip with exposed vertebral bone (B), hyperplastic epithelial regrowth at the edges (arrowhead), moderate mixed leukocytes and dilated lymphatics (*), and a few osteoclasts remodeling the exposed bone (arrows). H&E stain 4X.

A giant garter snake (Thamnophis gigas) slithering through grass, photographed during field work in western Oregon.

Photographs from a sandhill crane (Antigone canadensis) found dead in Indiana, U.S.A.  (A) There is a firm mass on the right cranial hock with a roughened black and tan surface. (B) On cut section, the mass is gelatinous, mottled light pink to gray, and extends to the joint space (arrow).

Photomicrographs from a sandhill crane (Antigone canadensis) found dead in Indiana, U.S.A.  (A) The mass is composed of islands of well-differentiated chondrocytes separated by fibrovascular connective tissue. There is minimal cellular pleomorphism and no mitotic figures are seen (inset).

Relative risk maps of combined Bsal risk, comparing (a) pre-action risk (2010–2015), to (b) risk after implementation of surveillance and of importation restrictions on over 200 salamander species. Relative risk scores were scaled to 2010–2015. (c) Change in relative risk score per county as proportion of pre-action risk.

Photomicrograph from a raccoon (Procyon lotor) found sick and euthanized in Texas, US.  (A) A cluster of schistosome ova are present in the pancreas. Ova are thin-shelled and are not operculated. Each viable egg contains a miracidium (arrows). The ova are surrounded by infiltrates of eosinophils, macrophages, and lymphocytes. H&E stain.

This rat snake is a preserved museum specimen with snake fungal disease that was collected in Tennessee in 1973. The photo was taken at the USGS National Wildlife Health Center in 2017 as part of a study.

Photographs from a raccoon (Procyon lotor) from Arizona, US.  (A) Large tan nematodes (arrowheads) are present within the subcutaneous tissue and muscle fascia in the distal right forelimb. (B) Closer view of the distal right forelimb showing the large tan nematodes (arrowheads).

Photomicrographs from a wild turkey (Meleagris gallopavo) found dead in Minnesota, USA.  (A) The normal epithelium becomes markedly thickened due to hyperplasia of the stratum spinosum (left to right) with regions of ulceration and crusting (arrow). H&E stain.

Photographs from a wild turkey (Meleagris gallopavo) found dead in Minnesota, USA.  (A) There are numerous multifocal to coalescing yellow proliferative lesions covering the eyelids, head, and neck with a region of ulceration and necrosis (*).  (B) Yellow irregular plaques (arrow heads) multifocally cover the oral cavity.

Photographs and photomicrographs from an exotic duck.  (A) Grossly, the spleen is enlarged, firm, and yellow (arrow). Throughout the liver are multifocal to coalescing firm tan nodules (arrowheads).  (B) The liver contains multifocal granulomas (asterisk). H&E stain.