“Naturally acquired immunity confers stronger protection against infection and symptomatic disease caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 2-dose vaccine-indued immunity.”–Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Naturally Acquired Immunity versus Vaccine-induced Immunity, Reinfections versus Breakthrough Infections: A Retrospective Cohort Study
The study focused on data from Maccabi Healthcare Services (MHS), Israel’s second largest Health Maintenance Organization, the study was published 01JUL2022 in the journal Clinical Infectious Diseases.
“SARS-CoV-2-naive vaccinees had a 13.06-fold (95% confidence interval [CI], 8.08–21.11) increased risk for breakthrough infection with the Delta variant compared to unvaccinated-previously-infected individuals, when the first event (infection or vaccination) occurred during January and February of 2021.”
“After adjusting for comorbidities, we found a 27.02-fold risk (95% CI: 12.7 to 57.5) for symptomatic breakthrough infection as opposed to symptomatic reinfection (P < .001)”
“This is the largest real-world observational study comparing naturally acquired immunity, gained through previous SARS-CoV-2 infection, to vaccine-induced immunity, afforded by the BNT162b2 mRNA vaccine. Our large cohort, enabled by Israel’s rapid rollout of the mass-vaccination campaign, allowed us to investigate the risk for additional infection—either a breakthrough infection in vaccinated individuals or reinfection in previously infected ones—over a longer period than thus far described.
Our analysis demonstrates that SARS-CoV-2-naïve vaccinees had a 13.06-fold increased risk for breakthrough infection with the Delta variant compared to those previously infected, when the first event (infection or vaccination) occurred during January and February of 2021. The increased risk was significant for a symptomatic disease as well.”
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