You mentioned Dr. John Campbell in an early post regarding CV 19. Unlike Dr Fauci, I had never heard of him until you clarified his bona fides. You may be interested to know that his name popped up again during an internet search about
immunity, this time in regard to exercise and the immune system.
https://medicalxpress.com/news/2018-04-debunks-myth-strenuous-suppresses-immune.html