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A comment on FDA authorizes Pfizer vaccine for kids age 12 to 15.

Re:FDA authorizes Pfizer vaccine for kids age 12 to 15 by stevefrench93 on Monday May 10, 2021 @07:15PM (#27112076)
According to this paper published recently in Nature Immunology, around 4 out of 5 people already have pre-existing immunity to SARS-COV-2.

> Of the SARS donors, 100% showed T cell responses to cross-reactive and/or specific ECs (HLA class I 86%, HLA-DR 100%; Fig. 5d,e), whereas 81% of PRE donors showed HLA class I (16%) and/or HLA-DR (77%) T cell responses to cross-reactive ECs (Fig. 5d).

https://www.nature.com/articles/s41590-020-00808-x.pdf

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Re:FDA authorizes Pfizer vaccine for kids age 12 to 15 by maxerickson on Monday May 10, 2021 @07:24PM (#27112168)
Having reactive antibodies isn't the same thing as immunity.
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Re:FDA authorizes Pfizer vaccine for kids age 12 to 15 by ttesttom on Monday May 10, 2021 @07:28PM (#27112204)
Pre-print for that paper was published 7 months ago and the sample collection date was from April-May 2020. Obviously there have been huge spikes in cases across the world since May 2020 with majority of infections occurring after that timeframe.

> Sample collection date Apr–May 2020

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