Pneumonia and meningitis in a Beagle Dog caused by Actinomyces bowdenii.

A 5-year-old female Beagle Dog was euthanized following ten days of inappetence, lethargy, and pain in the left cervical region that was not responsive to steroids or antibiotics. At necropsy, there were multiple soft dark red to tan nodules throughout all lung lobes, abundant purulent subdural exudate over the right temporal lobe of the brain, and minimally enlarged submandibular and tracheobronchial lymph nodes. Impression smear of the subdural pus and histologic section of the lung and meninges demonstrated small aggregates of rod-shaped to filamentous bacteria often surrounded by Splendori-Hoeppli material. Aerobic culture of the subdural exudate yielded pure growth of Actinomyces bowdenii. To our knowledge, this is the first report of central nervous disease or pneumonia associated with Actinomyces bowdenii.

Investigation of SARS-CoV-2 infection and associated lesions in exotic and companion animals.

Documented natural infections with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in exotic and companion animals following human exposures are uncommon. Those documented in animals are typically mild and self-limiting, and infected animals have only infrequently died or been euthanized. Through a coordinated One Health initiative, necropsies were conducted on 5 animals from different premises that were exposed to humans with laboratory-confirmed SARS-CoV-2 infection. The combination of epidemiologic evidence of exposure and confirmatory real-time reverse transcriptase-polymerase chain reaction testing confirmed infection in 3 cats and a tiger. A dog was a suspect case based on epidemiologic evidence of exposure but tested negative for SARS-CoV-2. Four animals had respiratory clinical signs that developed 2 to 12 days after exposure. The dog had bronchointerstitial pneumonia and the tiger had bronchopneumonia; both had syncytial-like cells with no detection of SARS-CoV-2. Individual findings in the 3 cats included metastatic mammary carcinoma, congenital renal disease, and myocardial disease. Based on the necropsy findings and a standardized algorithm, SARS-CoV-2 infection was not considered the cause of death in any of the cases. Continued surveillance and necropsy examination of animals with fatal outcomes will further our understanding of natural SARS-CoV-2 infection in animals and the potential role of the virus in development of lesions.

Systemic mucoid degeneration of the arterial tunica intima in a young dog.

A 27-mo-old, spayed female mixed-breed dog was presented with left forelimb pain, which progressed to full thickness necrosis of the soft tissues of multiple limbs. Clinical imaging and postmortem examination suggested multiple large arterial thromboemboli. Histologic examination of vascular lesions revealed markedly thickened tunica intima with polypoid intraluminal projections, which partially to entirely occluded the arterial lumen. The expanded tunica intima was comprised of intimal accumulation of Alcian blue-positive matrix with scattered spindle-to-satellite cells. These cells were positive for von Willebrand factor and vimentin but negative for α-smooth muscle actin, suggesting endothelial origin. Deposition of the intimal mucoid matrix was observed in the elastic and muscular arteries associated with regional ischemic changes. Mucoid emboli, likely from fragmentation of proliferative intimal tissue, were identified in smaller vessels supplied by affected arteries. Based on these findings, we diagnosed systemic mucoid degeneration of the arterial tunica intima. Such systemic arterial degeneration characterized by deposition of mucoid matrix in the tunica intima has not been reported previously in dogs, to our knowledge, and should be distinguished from thromboembolism and other degenerative vascular diseases.

Pathology in Practice.

In collaboration with the American College of Veterinary Pathologists.

Genomic Features of Salmonella enterica Subspecies houtenae Serotype 45:g,z51:- Isolated from Multiple Abdominal Abscesses of an African Fat-Tailed Gecko, United States, 2020.

Salmonella enterica subsp. houtenae (S. houtenae) is a common subspecies in reptiles and has been implicated as a source of serious and life-threatening diseases in humans. Although occurrence and significance of S. houtenae infections have been extensively studied, the genetic features of S. houtenae have remained unknown due to a lack of available high-quality genome sequences. We obtained the complete genome sequence of S. houtenae 45:g,z51:- strain 20-369 isolated from multiple abdominal abscesses of an African fat-tailed gecko (Hemitheconyx caudicinctus) using Nanopore and Illumina sequencing technologies and generated the 4.65Mbp complete genome sequence of the S. houtenae str. 20-369. We annotated and analyzed the genome sequence with the aim to gain a deeper understanding of the genome characteristics associated with its pathogenicity. Overall, this study found several interesting genomic features such as pseudogene formation, virulence gene profile, and novel genomic islands. This study provides basis for an understanding possible genetic mechanism underlying pathogenicity of S. houtenae 45:g,z51:- as well as a high-quality genome reference for future comparison studies.

Eurytrema procyonis and pancreatitis in a cat.

A young adult male domestic shorthair cat was presented for physical examination, routine vaccinations, and a fecal examination. Physical examination revealed no significant abnormalities. Eggs of the raccoon pancreatic fluke Eurytrema procyonis were detected by fecal flotation. Results of a complete blood count and serum biochemistry panel were normal. Abdominal sonography revealed an enlarged hypoechoic pancreas with a hyperechoic rim, and a distended and thickened pancreatic duct. Serum pancreatic lipase immunoreactivity (PLI) was increased. These findings supported the possibility of fluke-associated pancreatitis. Treatment with praziquantel/pyrantel/febantel was associated with resolution of sonographic abnormalities and normalization of PLI.