I suspect that the Northern Hemisphere will see an uptick in the severity of COVID19 in the Fall when the tilt of the earth reduces our vitamin D level.
There are other immunomodulators such as Vitamin K. Apparently corticalsteroids, which are produced in the adrenal gland, are also important as is the balance of magnesium, zinc and other minerals.
Personally, I think we could beat COVID19 back through good immune system health.
It is important to get the body ready for the infection, because sooner or later, it will get you