Protective action of natural and induced immunization against the occurrence of delta or alpha variants of SARS-CoV-2 infection: a test-negative case-control study.
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BMC Med. 2022 Feb 8;20(1):52. doi: 10.1186/s12916-022-02262-y.
BMC Med. 2022.
PMID: 35130877
Free PMC article.