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What are the differences between the updated vaccines (e.g. updated Moderna/Spikevax or Pfizer BioNTech/Comirnaty) and the previous vaccines?

Updated by HAS
The updated COVID-19 vaccines target newer strains of the virus compared to the older versions of vaccines to provide better protection against current and emerging strains. They are therefore expected to confer better protection against severe COVID-19 disease. The safety profiles of the updated vaccines are comparable to that of previous versions.

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COVID-19 Vaccines

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