Seeing the great summaries of durability of immunity from different vaccines in the paper from @vipintukur…

Seeing the great summaries of durability of immunity from different vaccines in the paper from @vipintukur prompts a few questions. 1) Given that for most vaccinations protection is <20 years, why aren’t adults required to get more updated vaccinations? 1/3 https://t.co/tO2CRaYiU9

Is it because vaccinating the young eliminates most community spread of the diseases, meaning adults are at much lower risk? 2) For how many of the listed vaccines does protection against severe disease remain after the listed period of protection? 3) Related to 2)… 2/3

…is durability of immunity here immunity to severe disease, or infection? /end