KRT18 and COVID-19: Other lesions observed in the BA.5-infected K18-hACE2 mouse brains, that have also been described in post-mortem COVID-19 patients, include perivascular edema (Figure 4C; Maiese et al., 2021; Pajo et al., 2021; Martin et al., 2022), occasional microglial nodules (Figure 4D; Al-Dalahmah et al., 2020; Matschke et al., 2020; Awogbindin et al., 2021; Schwabenland et al., 2021), and occasional small hemorrhagic lesions (Figure 4E; Mukerji and Solomon, 2021; Rosu et al., 2022).