virus strains

How Do Virus Strains Affect Vaccine Efficacy?

Variations in viral strains can impact the efficacy of vaccines. For example, vaccines developed for one strain may be less effective against another if the strains have significant antigenic differences. This is a common issue with the influenza virus, necessitating annual updates to the flu vaccine to match circulating strains. Similarly, the emergence of new SARS-CoV-2 variants has prompted research into updated or booster vaccines to enhance immunity against these variants.

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