Natural immunity superior to vaccinated immunity

This is clear indisputable evidence that natural immunity is far more durable than vaccinated immunity: The Covid protection lasted for 650 days with no noticeable decline.

"Prevalence and Durability of SARS-CoV-2 Antibodies Among Unvaccinated US Adults by History of COVID-19" Jennifer L. Alejo, MD1; Jonathan Mitchell, MBBS1; Amy Chang, MD1; et al JAMA Network
https://jamanetwork.com/journals/jama/fullarticle/2788894

In this cross-sectional study of unvaccinated US adults, antibodies were detected in 99% of individuals who reported a positive COVID-19 test result, in 55% who believed they had COVID-19 but were never tested, and in 11% who believed they had never had COVID-19 infection. Anti-RBD levels were observed after a positive COVID-19 test result up to 20 months, extending previous 6-month durability data.5

Study limitations include lack of direct neutralization assays, the fact that antibody levels alone do not directly equate to immunity,4,6 the cross-sectional study design, a convenience sample with an unknown degree of selection bias due to public recruitment, self-reported COVID-19 test results, the study population being largely White and healthy, and lack of information on breakthrough infections. Participants were given only 1 month to complete antibody testing, which may have contributed to the 52% rate among those invited to test.

Although evidence of natural immunity in unvaccinated healthy US adults up to 20 months after confirmed COVID-19 infection is encouraging, it is unclear how these antibody levels correlate with protection against future SARS-CoV-2 infections, particularly with emerging variants. The public health implications and long-term understanding of these findings merit further consideration.