This information about different safety profiles of different “lots” (batches of finished product of covid19 vaccines) is completely without precedent.
I’m thinking about it and I don’t yet have clear in my mind what the envelope of plausible / possible explanations are.
But the bottom line is that the majority of lots were associated with good short term safety, few hospitalisations & deaths, which is true for both the Pfizer & Moderna injections.
