Jiang B, Huang Q, Jia M, Xue X, Wang Q, Yang W, Feng L. Association between influenza vaccination and SARS-CoV-2 infection and its outcomes: systematic review and meta-analysis.
Chin Med J (Engl) 2022;
135:2282-2293. [PMID:
36378238 PMCID:
PMC9771237 DOI:
10.1097/cm9.0000000000002427]
[Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND
World Health Organization recommends that influenza vaccines should benefit as much of the population as possible, especially where resources are limited. Corona virus disease 2019 (COVID-19) has become one of the greatest threats to health systems worldwide. The present study aimed to extend the evidence of the association between influenza vaccination and COVID-19 to promote the former.
METHODS
In this systematic review, four electronic databases, including the Cochrane Library, PubMed, Embase, and Web of Science, were searched for related studies published up to May 2022. All odds ratios (ORs) with 95% confidence intervals (CIs) were pooled by meta-analysis.
RESULTS
A total of 36 studies, encompassing 55,996,841 subjects, were included in this study. The meta-analysis for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection provided an OR of 0.80 (95% CI: 0.73-0.87). The statistically significant estimates for clinical outcomes were 0.83 (95% CI: 0.72-0.96) for intensive care unit admission, 0.69 (95% CI: 0.57-0.84) for ventilator support, and 0.69 (95% CI: 0.52-0.93) for fatal infection, while no effect seen in hospitalization with an OR of 0.87 (95% CI: 0.68-1.10).
CONCLUSION
Influenza vaccination helps limit SARS-CoV-2 infection and severe outcomes, but further studies are needed.
REGISTRATION
PROSPERO, CRD42022333747.
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