MAPT and infection: A longitudinal study detected that certain cytokines, such as IL-1β, IL-4 and IL-6, and markers of neuronal dysfunction, such as beta-amyloid protein, total tau, p-T181-tau, light chain neurofilament and neurogranin, a marker of neuronal extracellular vesicles, remain elevated in the plasma of patients recovering from COVID-19 who self-reported neurological issues around 1 to 3 months after the initial infection [44].