Robert F. Kennedy Jr. on covid: what the evidence says · JRE #1999

What the evidence says 01 / RECORD

Kennedy has repeatedly cited a Cleveland Clinic study of its own employees (Shrestha et al., Open Forum Infectious Diseases, 2023) to claim the vaccinated face several times the COVID-19 risk of the unvaccinated; he made an identical claim, including the same 3.5-times figure, on this June 2023 Joe Rogan Experience episode. The study, which measured bivalent booster effectiveness in roughly 51,000 healthcare workers, did find a statistical association between a higher number of prior vaccine doses and higher subsequent infection risk during the Omicron/XBB period, and its authors wrote this unexpected finding needed further study. However, the study was not designed to isolate vaccine dose count as a cause of infection risk, did not control for behavioral or exposure differences between groups, and its lead author, Dr. Nabin Shrestha, told fact-checkers the association does not establish causation and that determining whether more vaccine doses cause greater susceptibility 'wasn't the point of the study.' Multiple fact-checking and expert reviews (FactCheck.org, PolitiFact) concluded the finding likely reflects confounding factors such as immune imprinting, differential exposure, or the health-seeking behavior of frequently vaccinated healthcare workers rather than a direct causal effect of vaccination, and cautioned the healthcare-worker cohort's results should not be generalized to the public. A subsequent Cleveland Clinic follow-up study by the same lead author, using the same employee cohort, found being 'up-to-date' on vaccination was not associated with lower or higher COVID-19 risk during the XBB period (adjusted HR 1.05, 95% CI 0.88-1.25). The claim is considered a misleading interpretation of a real but limited and unreplicated observational finding.