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The 15 pages that link to Antigenic drift, each with the reason it gives.

• Herd immunityRelated: Immune escape can weaken protection against transmission and shift the immunity needed to limit spread.

• AntigenRelated: Changing viral antigens can reduce protection from prior infection or vaccination.

• Antigenic variationBroader topic: Repeated small antigen changes can weaken recognition by antibodies from earlier infections or vaccination.

• Influenza vaccineRelated: Drift can make circulating influenza viruses less similar to vaccine strains.

• Antigenic shiftCompared with: Drift changes antigens incrementally, unlike shift's abrupt reassortment-driven changes.

• InfluenzaRelated: Drift helps explain why influenza vaccines are updated regularly.

• Influenza A virusRelated: Drift continually changes influenza A strains and necessitates updates to seasonal vaccines.

• HemagglutininRelated: Mutations in hemagglutinin help influenza escape antibodies and necessitate vaccine updates.

• NeuraminidaseRelated: Changes in neuraminidase can alter antibody recognition as influenza lineages evolve.

• Neutralizing AntibodyRelated: Drift can alter antibody targets and weaken existing neutralization.

• Viral evolutionBroader topic: It is a visible evolutionary outcome of repeated mutation and selection in viruses such as influenza.

• Influenza virusRelated: Drift in influenza surface proteins helps seasonal strains evade existing immunity.

• Influenza B virusRelated: Drift in hemagglutinin and neuraminidase helps influenza B evade existing immunity.

• VirologyRelated: Drift can reduce existing immunity and complicate vaccine design.

• OrthomyxoviridaeRelated: Mutations in influenza surface-protein genes drive gradual antigenic change.