Interesting that the CDC seems to have intentionally withheld this study until after the U.S. Supreme Court ruled on Biden's vaccine mandate. A person could be forgiven for concluding that the apparatchiks at the CDC didn't want anyone to know, or remember, that natural immunity is better than vaccines.

Natural immunity ‘gives better protection against Covid delta variant than vaccines alone’
Unvaccinated people who have caught and recovered from Covid-19 have better protection against the delta variant than those who have been double-jabbed but...