MAPT and COVID-19: Recent studies have also related serum biomarkers to COVID-19 severity and mortality, including neurofilament light chain (NfL), glial fibrillary acidic protein (GFAp), total TAU (Microtubule-Associated Protein Tau, MAPT), and Ubiquitin carboxy-terminal hydrolase L1 (UCH-L1) [4].