The continued emergence of SARS-CoV-2 variants and breakthrough infections following vaccination underscore the need to study the effectiveness of current COVID-19 vaccines in the real world.
To date, only two mRNA COVID-19 vaccines have been approved for marketing, mRNA-1273 developed by Moderna and BNT162b2 developed by Pfizer/BioNTech, which have proven to be very effective in preventing...
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