Can transgenic mice studies illuminate neurological complications associated with SARS-CoV-2 in humans?

The potentially deadly COVID-19 has not affected animals with corresponding severity. To understand the mechanism of severe disease, animal models have been used. This includes a mouse model that expresses human angiotensin-converting enzyme 2 (hACE2) under the cytokeratin 18 promoter (K18-hACE2). A new study indicates that this may not be a faithful model of human lethal infection with SARS-CoV-2.