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Images from the National Wildlife Health Center.
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.
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.
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.
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.
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).
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).
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.
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.
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.
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).
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.
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 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.
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.
Photomicrographs from a big brown bat (Eptesicus fuscus) from Wisconsin, USA. H&E stain. (A) Low magnification of a cross section through the nares showing nasal cavity (*), oral mucosa (arrowhead), and haired skin (arrow). (B) Higher magnification showing a normal hair follicle (arrow) surrounded by sebaceous glands.
Photomicrographs from a big brown bat (Eptesicus fuscus) from Wisconsin, USA. H&E stain. (A) Low magnification of a cross section through the nares showing nasal cavity (*), oral mucosa (arrowhead), and haired skin (arrow). (B) Higher magnification showing a normal hair follicle (arrow) surrounded by sebaceous glands.
Photographs from a mallard duck (Anas platyrhynchos) found dead in Idaho, USA. (A) The lungs are dark red and have multifocal 1-3 mm diameter white to tan nodules disseminated throughout (arrows). (B) Cut section of the lung showing the nodules within the parenchyma (arrows).
Photographs from a mallard duck (Anas platyrhynchos) found dead in Idaho, USA. (A) The lungs are dark red and have multifocal 1-3 mm diameter white to tan nodules disseminated throughout (arrows). (B) Cut section of the lung showing the nodules within the parenchyma (arrows).
Photomicrographs from a mallard duck (Anas platyrhynchos) found dead in Idaho, USA. (A) Multiple granulomas (*) with eosinophilic necrotic centers efface the lung. H&E stain. (B) Granulomas contain many degenerate heterophils and a few multinucleated giant cells (arrows). H&E stain.
Photomicrographs from a mallard duck (Anas platyrhynchos) found dead in Idaho, USA. (A) Multiple granulomas (*) with eosinophilic necrotic centers efface the lung. H&E stain. (B) Granulomas contain many degenerate heterophils and a few multinucleated giant cells (arrows). H&E stain.
Administering the white-nose syndrome vaccine to a bat during a field trial.
Administering the white-nose syndrome vaccine to a bat during a field trial.
A bat receiving the white-nose syndrome vaccine during a field trial to study vaccine efficacy.
A bat receiving the white-nose syndrome vaccine during a field trial to study vaccine efficacy.
Cluster of cave myotis bats (Myotis velifer) on cave wall in Texas.
Cluster of cave myotis bats (Myotis velifer) on cave wall in Texas.
Photographs from a red wolf (Canis rufus) found dead in North Carolina, USA. (A) Adult heartworms (Dirolfilaria immitis) in the right ventricle and atria of the heart and extending into the pulmonary artery. (B) Hard, haired nodule on the medial surface of the distal radius of the right leg.
Photographs from a red wolf (Canis rufus) found dead in North Carolina, USA. (A) Adult heartworms (Dirolfilaria immitis) in the right ventricle and atria of the heart and extending into the pulmonary artery. (B) Hard, haired nodule on the medial surface of the distal radius of the right leg.
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.
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.