A
The reason why it is likely to be lots of long Covid is not just the medical literature indicating that around 10% of infections lead to long term (> 3 months) symptoms.
It is because it is often young women who drop out from work. This is the demographic most at risk from long Covid due to combination of exposure (healthcare, teaching) and a stronger immune system (doing more damage to the body).
Long Covid can easily be confused with burnout, which also has severe fatigue, brain fog, inability to focus.
One is caused by a virus driving the brain's immune system in overdrive, the other by trying to do too much.
And they can interact. If you brain is mush from a virus, you can try and push through, and then push you over de edge.
A recent paper on the biological mechanisms:
"immune dysregulation, viral persistence, autonomic dysfunction, microvascular pathology"
And long Covid. If you do not protect the population against repeated Covid, there will be more short-term and long-term illness.