Infective endocarditis (IE) is a rare but potentially fatal cause of feline arterial thromboembolism (ATE), most commonly affecting the mitral or aortic valves. Although Enterococcus faecalis is rarely reported in cats, it can induce severe endocardial infection and systemic embolic complications. This case report describes a one-year-old neutered male British Longhair cat that presented with acute hindlimb paralysis and dyspnoea lasting one day. The cat had a three-month history of lower urinary tract infection, but no known cardiac disease. On admission, all the classical signs of arterial obstruction were evident. Laboratory tests revealed neutrophilic leukocytosis and markedly increased serum amyloid A, indicating systemic inflammation. Echocardiography revealed thickened aortic valve leaflets with irregular vegetations and severe regurgitation, with no evidence of intracardiac thrombus. Left ventricular systolic function assessed by two-dimensional speckle-tracking echocardiography was mildly reduced compared with reference values. Blood culture confirmed the presence of E. faecalis, which was susceptible to β-lactams but intrinsically resistant to cephalosporins. Initial empirical therapy included furosemide, low-molecular-weight heparin, and broad-spectrum antibiotics. This was later adjusted to ampicillin–sulbactam, and metronidazole upon receiving the culture results. This report emphasises the importance of considering xone,E. faecalis-associated infective aortic endocarditis in the diagnostic and therapeutic evaluation of feline ATE cases.

This study investigated the molecular characteristics and genetic diversity of Fowl adenovirus (FAdV) strains circulating in commercial broiler and layer flocks in the Southern Marmara and Aegean regions of Türkiye between January and December 2025. Liver samples (n = 120) collected from twelve flocks with increased mortality and clinical signs compatible with adenoviral infection were analyzed. Detection was performed using circular amplification technology and PCR targeting the hexon L1 region, and positive samples were sequenced for molecular characterization. BLAST analysis showed that all isolates belonged to Aviadenovirus hepatitidis and were identified as serotype 8b. Pairwise comparisons showed high nucleotide identity among isolates (97.4–100%) and 98.1–100% similarity with the Turkish reference strain MK937075. Only three isolates displayed nucleotide substitutions, while most sequences were identical within the analyzed region. Amino acid similarity ranged from 95.2% to 100%. Phylogenetic analysis revealed that all isolates clustered within a single monophyletic group together with previously reported Turkish FAdV-8b strains. Necropsy findings included hepatomegaly, multifocal hepatic pallor, petechial hemorrhages, gizzard erosion, and serous pericardial involvement. The detection of genetically closely related isolates across multiple provinces suggests regional circulation of a common viral lineage. These findings demonstrate that FAdV-8b is currently the predominant serotype associated with inclusion body hepatitis outbreaks in this major poultry production area and highlight the importance of molecular surveillance and targeted control strategies, including breeder monitoring and region-specific vaccine development.