I realize this is a small study, but many of the "young, healthy, seronegative volunteers" had cognitive problems after they were given the COVID virus.
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>>>Patient-reported outcomes and cross-sectional evidence show an association between COVID-19 and persistent cognitive problems. The causal basis, longevity and domain specificity of this association is unclear due to population variability in baseline cognitive abilities, vulnerabilities, virus variants, vaccination status and treatment. . . . These results support larger cross sectional findings indicating that mild Wildtype SARS-CoV-2 infection can be followed by small changes in cognition and memory that persist for at least a year. The mechanistic basis and clinical implications of these small changes remain unclear. . . .
We found that volunteers who exhibited sustained viral load after inoculation with SARS-CoV-2 performed worse on a measure of global cognition, than volunteers who did not exhibit sustained viral load. This deficit persisted up to a year after inoculation. <<<