FDA approved the "1st oral anticoagulant drug for children" prior to the introduction of the vaccine for 5-11 year olds.

[They] knew everything
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https://www.fda.gov/news-events/press-announcements/fda-approves-first-oral-blood-thinning-medication-children

~ 21 Jun 2021

FDA (Food and Drug Assassination) approved:

Pradaxa (dabigatran etexilate) to treat children aged 3 months to < 12 years with venous thromboembolism ( a disease that forms clots in the veins).

Pradaxa is the 1st FDA-approved oral anticoagulant for children.

"...another option to treat and prevent deadly blood clots".