Sharyl Attkisson is brilliant IMO and a recent summary by her included my seminal Natural immunity op-ed and she cited a study as an update; its in my cited op-ed summary but worth highlighting here

Puya-Dehgani-Mobaraki: Long-Term Persistence of IgG Antibodies in recovered COVID-19 individuals at 18 months and the impact of two-dose BNT162b2 (Pfizer-BioNTech) mRNA vaccination on the antibodies

Long-Term Persistence of IgG Antibodies in recovered COVID-19 individuals at 18 months and the impact of two-dose BNT162b2 (Pfizer-BioNTech) mRNA vaccination on the antibody response

Key finding:

“At 18 months, 97% participants tested positive for anti-NCP hinting towards the persistence of infection-induced immunity even for the vaccinated individuals. Our study findings demonstrate that while double dose vaccination boosted the IgG titers in recovered individuals 161 times, this “boost” was relatively short-lived. The unvaccinated recovered individuals, in contrast, continued to show a steady decline but detectable antibody levels.”

Bottom line: a win again for natural immunity

My Brownstone op-ed with 150 pieces of evidence, studies showing superiority of natural immunity over vaccine immunity as it pertains to COVID