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For the record, the Thymus does not produce new T cells. New T cells are formed from stem cells in bone marrow.

What the Thymus does do, is it plays a key role in prune auto-reactive T cell lines. As the only organ in the body which expresses pretty much the entire antigenic profile of the body, it is critical in ensuring that the cells which keep us safe from viral/parasitic/microbial threats do not end up waging a war against our own body.

By cruel twist of fate, however, this critical gland is progressively atrophied by long term exposure to sex hormones.

Last I was actively researching it, this was positedto be a factor in increased prevalence of auto-immune problems in the elderly.

Interestingly enough, this does explain a couple Thai (or was it Taiwanese?) studies I remember seeing early on in the Coronavirus outbreakthat apparently showed some promise in using HIV drugs to help with treating the Coronavirus.