4/28/2023 0 Comments Natural reader for mac os x![]() The details of the IRB/oversight body that provided approval or exemption for the research described are given below: ![]() ![]() I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained. There was no external funding for the project. The authors have declared no competing interest. ![]() Individuals who were both previously infected with SARS-CoV-2 and given a single dose of the vaccine gained additional protection against the Delta variant. Conclusions This study demonstrated that natural immunity confers longer lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity.
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