Researchers were already asking questions about Long Hauler Covid back in December of 2020. They hypothesized that either ongoing viral infection after an inadequate immune response or a dysfunctional immune response were responsible for this chronic post viral malady affecting millions. Research continues into the why’s of long COVID
Baig, Abdul Mannan. “Deleterious Outcomes in Long-Hauler COVID-19: The Effects of SARS-CoV-2 on the CNS in Chronic COVID Syndrome.” ACS chemical neuroscience vol. 11,24 (2020): 4017-4020. doi:10.1021/acschemneuro.0c00725
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7724755/