Current inactivated influenza vaccines provide suboptimal protection against antigenic drift, and repeated annual vaccinations shape antibody specificity but the effect on protection from infection is not well understood.

中文翻译：

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重复接种流感疫苗可提供针对不同 H3N2 病毒的累积保护

目前的灭活流感疫苗对抗原漂移的保护效果不佳，每年重复接种疫苗会形成抗体特异性，但对感染保护的影响尚不清楚。