Immunohistochemistry staining of (A) SARS-CoV-2 spike protein, (B) SARS-CoV-2 RNA in-situ hybridization of brain sections from k18hACE2 mice uninfected or infected with 5 × 104 PFU 7 days after administration. Bar is 200 μm. Western blot analysis of SARS-CoV-2 spike protein in the (C) frontal cortex, (D) olfactory blub, and (E) VTA from brain tissue lysates of k18hACE2 mice in uninfected or infected with 5×104 PFU 7 days after administration. The data are representative of 6 mice per group.