and Relevance: Severe necrosis and mild fibrosis were observed in the liver and forelimb skeletal muscles. Based on histological analysis, we diagnosed iron overload myopathy by secondary hemochromatosis. Secondary hemochromatosis with severe muscle atrophy and myositis is very rare, and this is the first report of iron-overload myopathy in a dog.

Objective: This study examined the association between chronological age and pulp to tooth (P/T) volume ratio in dogs using computed tomography (CT) of the right maxillary canine and right maxillary fourth premolar (PM4) teeth. Methods: Ninety-five canine skulls, aged five to 216 months, were examined using a twoslice CT scan machine. Volumetric analyses of the right maxillary canine and PM4 were performed. Statistical analysis, including Spearman's correlation and regression analysis, was conducted to assess the relationship between age and the P/T volume ratio. Results: This study included 60 male and 35 female dogs, with no significant age difference between genders (p = 0.655). A strong negative correlation was observed between age and the P/T volume ratio for the right maxillary canine (r = 0.88, p < 0.001) and PM4 (r = 0.77, p < 0.001) teeth. Logarithmic regression models provided a better fit for age prediction (R2 = 0.78 for the right maxillary canine, R2 = 0.67 for PM4) compared to linear models. Conclusions and Relevance: CT-based volumetric analysis of the P/T ratio in the right maxillary canine and PM4 teeth offers a precise, non-invasive method for estimating the age of dogs. This technique can improve the accuracy of age estimations, particularly in forensic and clinical settings, providing valuable insights for veterinarians and researchers.

and Relevance: Chromatin accessibility is crucial in gene regulation in domestic animals, influencing development, immune response, and productivity. Despite the progress, more comprehensive epigenomic datasets and cross-species analytical tools are needed to harness chromatin accessibility in domestic animal research. Understanding these mechanisms has practical applications in improving livestock traits, advancing breeding programs, and developing disease-resistant animals, highlighting the importance of integrating epigenetic and genomic tools for enhancing animal health and productivity.

and Relevance: This case is the first instance of using tracheal stenting to effectively manage tracheal stenosis in a cat, successfully resolving a respiratory emergency, and ensuring long-term care.

Methods: Uropathogenic E. coli (UPEC) strains were analyzed for phylogenetic grouping polymerase chain reaction, AMR, transferable resistance plasmids, and multilocus sequence typing. Results: Sixty-seven UPECs were isolated from urine samples of dogs (n = 57) and cats (n = 10).Regarding age, the incidence of UTI was the highest in the 11 to 15 years range (46.3%, 31/67). Regarding sex, it accounted for 58.2% (n = 39) in female dogs and 11.9% (8/67) in female cats. Phylogroup B2 was the most frequent (n = 51, 75.0%) among all strains, followed by D (16.2%), A (7.4%), and B1 (1.5%). Thirty-seven (55.2%) UPECs were multidrugresistant (MDR), and 24 (35.8%) of them belonged to phylogroup B2. Extended-spectrum cephalosporin and carbapenemase genes were detected in 18 (26.9%) UPECs and plasmids carrying these resistance genes were conjugated between strains. Thirty sequence types (STs) were identified among the total strains. Among the UPECs (n = 51) with phylogroup B2, 23 STs were identified, with ST73 being the most frequent (n = 12, 17.9%), followed by ST131 (n = 9, 13.4%). Conclusions and Relevance: Phylogroup B2 strains, particularly ST73 and ST121, were most prevalent in UPECs from Korean companion dogs and cats. For MDR UPECs, appropriate antibiotic selection is essential for the treatment of UTIs.

Objective: We aimed to elucidate the metabolic function and phenotype of AK5, a gene with an unknown function in metabolism. Methods: We generated AK5 knockout (KO) mice and administered high-fat and fasting diets to the mice to confirm their physiological phenotype and metabolic differences. Results: In the high-fat diet (HFD) test, no differences in body weight, epididymal white adipose tissue (eWAT), or fat mass of AK5 KO mice were observed. In indirect calorimetry, the respiratory exchange ratio and activity counts increased in normal chow diet mice, but there was no difference between the HFD groups. At the mRNA level, there were no significant differences in the expression of lipid metabolism markers between wild-type and AK5 KO mice. Still, the glucose signal of adipocytes increased in AK5 KO mice. In the fasting test, the eWAT of AK5 KO mice was significantly reduced, as was the expression of lipid metabolism and inflammation-related immune markers. Thus, the apoptosis of adipocytes increased, and an imbalance in energy metabolism occurred. Conclusions and Relevance: When AK5 KO mice are energy deficient, it becomes difficult to use eWAT for energy storage, imbalance occurs, and apoptosis of adipocytes in eWAT increases.

Objective: To establish a serological baseline, assess antibody stability, and compare the efficacy of three HPAI (H5) vaccines. Methods: We analyzed over 9,000 blood samples and 6,420 swabs from approximately 1.5 million birds up to 64 weeks old. HI (β, α), RT-PCR, and SN tests were conducted, with statistical analysis performed using two-way ANOVA. Results: The serological baseline (GM titer) using H5N8 antigens from A/Chicken/Iran/162/ 2016 varied. The Re6+Re8 vaccine produced higher and more stable HI β titers than the H5N3 and baculovirus vaccines. Serum HI α neutralization ability was similar for Re6+Re8 and H5N3 vaccines, both 100 times greater than the baculovirus vaccine. Neutralization indices for H5N3, Re6+Re8, and baculovirus vaccines were 4.7, 4.5, and 4.2 (log2), respectively. Conclusions and Relevance: After two vaccinations, Re6+Re8 exhibited the most stable HI β antibody response, while H5N3 had the highest neutralization index, surpassing Re6+Re8 by 0.2 and the baculovirus vaccine by 0.5. These findings highlight discrepancies between HI β and SN test results, with SN being a stronger indicator of protective titers due to its in vivo methodology, compared to the in vitro HI assay.

Objective: Using semiquantitative risk scoring, this study estimated the probability of ASF transmission in 23 selected provinces. Methods: The factors influencing ASF spread were identified; 10 through a literature review and the positivity for ASF virus (ASFv) of meat samples from an ongoing surveillance study.Secondary data from each sampled province were collected, and the provinces were scored across these factors and classified into one of three risk categories. Results: Six out of 23 provinces were categorized as high-risk due to the high number of ASFv-positive meat samples, backyard pigs, and ASF occurrences. Conversely, four provinces were classified as low-risk due to consistently low scores across all indicators. The difference in the meat contamination level between low- and high-risk provinces emphasizes the importance of including this factor in the ASF spread assessment. Conclusions and Relevance: Risk estimation of ASF transmission must consider meat sample contamination. Active surveillance at local borders can monitor contamination and prevent ASFv sources from entering areas. This approach allows the government to allocate resources and prioritize higher-risk areas.