I was scratching my head about this “vaccination with 5G chips” when I heard it. Apart from not being feasible, I was wondering where they got this absurd idea from.

Until I stumbled over a product: You can buy syringes with embedded RFID chips. That you can use to track “best before” dates and lot numbers with. Or one can check if they forgot one inside the patient after a surgery. It has, of course, nothing to do with the contents of the syringes, and of course it is not 5G but NFC/RFID. But yea, for the stupid and confused this is close enough.