Figure 4
From: Ultra- and micro-structural changes of respiratory tracts in SARS-CoV-2 infected Syrian hamsters
IHC results of the trachea. A Tracheal epithelium was strongly positive against SARS-CoV-2 nucleocapsid protein (NP) at 2 and 4 dpi. IHC positive mononuclear inflammatory cells were observed in the lamina propria (black arrowheads). Counterstain with methyl green. Scale bars, 50 μm; Insert: higher magnification (n = 3 per group). B Quantification of IHC positive area in the trachea against SARS-CoV-2 NP. Data are presented as means ± SD. Both 2 dpi and 4 dpi groups showed strong positive areas compared to control and other infection groups (P < 0.01). Positive areas in 8, 12, and 16 dpi groups were strongly detected compared to the control group (P < 0.01) (n = 3 per group).