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by birken 1895 days ago
This lines up exactly with what Dr. Daniel Griffin talked about in the most recent clinical update podcast for TWIV [1]. Apparently aspirating makes the shot more painful, because the needle is in the body longer, and serves no benefit as long as the vaccinator is putting it in the right location.

1: https://www.microbe.tv/twiv/twiv-741/ (towards the end)