I watched my partner have a very bad run in with Epstein-Barr Virus (a decade ago). Wiped her out for months and months. It took years before she was back to 10

I watched my partner have a very bad run in with Epstein-Barr Virus (a decade ago). Wiped her out for months and months. It took years before she was back to 100%. It might not be clear what all the causes of long-covid, brain fog are but it's definitely possible for viruses to have long lasting and poorly studied impacts.