JAMA case-negative control study found Pfizer vaccine effectiveness against symptomatic infection in children age 12 to 15 dropped to zero in 4 months and went negative (vaxed more likely to have symptomatic infection than unvaxed) at 7 months.https://t.co/igdIW82SPX pic.twitter.com/n6zPW2HbWK

— Phil Kerpen (@kerpen) May 13, 2022

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