Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: SARS-CoV-2 viral shedding in hamsters infected with WT, Alpha, or Beta variants. Hamsters were inoculated intranasally with either B1 (WT), B.1.351 (Beta), B.1.1.7 (Alpha), or control. a) Titers of infectious virus were determined from oral swabs collected 3, 7, 14, and 28 days post-challenge. Error bars represent standard deviation ( n = 10 per group). Five animals per group were scheduled for necropsy at 14 dpi, n = 5 per group for the 28 dpi assessments. b) Viral loads were determined from oral swabs collected 3, 7, 14, and 28 days post-challenge. Error bars represent standard deviation ( n = 10 through 14 dpi; n = 5 at 28 dpi) c) Percent body-weight change in golden Syrian hamsters over 28 days post-infection with SARS-CoV-2 variants. Hamsters were weighed on days 3,7, 14 & 28 post-infection. Data represent the percent weight change compared to pre-infection weights. Error bars represent standard deviation ( n = 10 through 14 dpi; n = 5 at 28 dpi).

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Infection, Control, Virus, Standard Deviation

Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: Lung pathology in Syrian golden hamsters challenged by SARS-CoV-2 Variants ( n = 5 per group). a) Lung histopathology b) Fibrosis c) Quantification of inflammatory cell infiltration in lung tissues (Average number of inflammatory cell infiltrates per field of view in lung tissue). Two-way- ANOVA with Dunnett’s multiple comparisons test was performed d) Quantification of fibrosis presented as mean percentage fibrosis of total lung tissue. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed, * p < 0.05, ** p < 0.001, *** p < 0.0001, **** p < 0.00001. Error bars represent standard deviation. Images are at 20 × magnification; scale bar = 100 µm.

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Histopathology, Standard Deviation

Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: Nasal turbinate pathology in Syrian golden hamsters infected with SARS-CoV-2 variants. a) Inflammation b) fibrosis were scored in nasal turbinates at 14 and 28 days post-infection in hamsters inoculated intranasally with wild-type B1 (WT), B.1.351 (Beta), B.1.1.7 (Alpha) or control ( n = 5 per group). Two-way- ANOVA with Dunnett’s multiple comparisons test was performed, * p < 0.05. Error bars represent standard deviation.

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Infection, Control, Standard Deviation

Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: Cardiac pathology in Syrian golden hamsters challenged by SARS-CoV-2 Variants. a) Cardiac histopathology b) Representative cardiac Fibrosis c) Representative Verhoeff–Van Gieson staining; collagen (dark pink),myocardium (yellow-brown), and elastic fibers (black) d) Quantification of inflammatory cell infiltration in cardiac tissues (Average number of inflammatory cell infiltrates per field of view in cardiac tissue). Two-way- ANOVA with Dunnett’s multiple comparisons test was performed e) Quantification of fibrosis presented as mean percentage fibrosis of total cardiac tissue. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed. f) Quantification of collagen presented as mean percentage collagen of total cardiac tissue. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed. g) Quantification of elastin presented as mean percentage elastin of total cardiac tissue. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed, * p < 0.05, ** p < 0.001, *** p < 0.0001, **** p < 0.00001. Error bars represent standard deviation. Images are at 20 × magnification; scale bar = 100 µm. n = 5 per group.

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Histopathology, Staining, Standard Deviation

Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: Kidney pathology in Syrian golden hamsters challenged by SARS-CoV-2 Variants. a) Representative Kidney Fibrosis b) Quantification of fibrosis presented as mean percentage fibrosis of total kidney tissue. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed. * p < 0.05, ** p < 0.001, *** p < 0.0001, **** p < 0.00001. Error bars represent standard deviation. Images are at 20 × magnification; scale bar = 100 µm. n = 5 per group.

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Standard Deviation

Journal: Virus Research

Article Title: Comparison of SARS-CoV-2 variant pathogenicity in a long-COVID Syrian hamster model

doi: 10.1016/j.virusres.2026.199711

Figure Lengend Snippet: Total number of spleen germinal centers in Syrian golden hamsters following infection with SARS-CoV-2 variants. The total number of germinal centers per spleen section was quantified on days 14 and 28 post-infection in hamsters inoculated intranasally with B1 (WT), B.1.351 (Beta), B.1.1.7 (Alpha), or control. Two-way- ANOVA with Dunnett’s multiple comparisons test was performed. *** p < 0.0001, **** p < 0.00001. Error bars represent standard deviation . n = 5 per group.

Article Snippet: Six-to-eight -week-old male golden Syrian hamsters were purchased from Charles River Animals were housed at the BSL2 facility at the University of Toronto and transferred to the BSL3 facility at the University of Toronto for challenge experiments.

Techniques: Infection, Control, Standard Deviation

Journal: iScience

Article Title: Antigen-specific IgG glycosylation profiles in hamsters and macaques following COVID-19 vaccination

doi: 10.1016/j.isci.2026.115400

Figure Lengend Snippet: IgG subclasses in Syrian Golden Hamsters and Rhesus Macaques (A) Relative abundances of the IgG subclasses determined by the LC-MS/MS analysis of purified IgG from a commercially available hamster serum and pooled serum from seven healthy macaques. (B) Hamster IgG Fc glycopeptide clusters observed after total IgG capture. Extracted ion chromatograms of three glycopeptide species per subclass are shown. The glycan compositions are indicated as follows: green circle = mannose; yellow circle = galactose; blue square = N-acetylglucosamine; red triangle = fucose; light-blue diamond = N-glycolylneuraminic (sialic) acid. Glycopeptide species were assigned based on accurate mass. (C) Isotopic patterns of hamster IgG1 and IgG2 H3N4F1 glycopeptides and a spectrum depicting the summed intensities of both molecules. The glycan compositions are indicated as follows: H = hexose; N = N-acetylhexosamine; F = deoxyhexose (fucose). (D) Macaque IgG Fc glycopeptide clusters observed after total IgG capture. Extracted ion chromatograms of three glycopeptide species are indicated. The glycan compositions are as in (B). Glycopeptide species were assigned based on accurate mass.

Article Snippet: Mesocricetus auratus ; Syrian Golden Hamster , Janvier Labs , Rj:AURA.

Techniques: Liquid Chromatography with Mass Spectroscopy, Purification, Glycoproteomics