My thoughts too Sunny. Use a saline solution, but you can't inject air. But if the plunger was all the way down, how could someone not notice this.In fact, if the syringes contained nothing but air, I'm surprised they didn't kill anyone by injecting air into their bodies.
Of course the vaccine is intramuscular right? If an air bubble was injected directly into a vein, that would result in immediate death, so this may explain why it hasn't. Vaccines I had in the past were injected into the muscle of my outer arm. This causes bruising and soreness, but even with just an empty jab it wouldn't kill.
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