KRT18 and COVID-19: This route of entry into the brain has been implicated in a non-human primate study (Jiao et al., 2021), hamsters (De Melo et al., 2023) and may also be relevant for COVID-19 patients, although the fulminant brain infection seen in K18-hACE2 mice is not a feature of COVID-19 in humans (Bulfamante et al., 2020; Matschke et al., 2020; Awogbindin et al., 2021; Meinhardt et al., 2021; Beckman et al., 2022; Serrano et al., 2022).