A Systematic Review on COVID-19 Vaccine Strategies, Their …
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8708628/
WebNov 24, 2021 · There is a need to systematically review the existing vaccine candidates and investigate their safety, efficacy, immunogenicity, unwanted events, and limitations. The review was undertaken by searching online databases, i.e., Google Scholar, PubMed, and ScienceDirect, with finally 59 studies selected.
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