Where are you getting this info, please? I know there was speculation about batch differences b/c of 'how bad is my batch?' info but were batches tested and saline batches actually discovered? I believe that the serum vials were diluted with varying amounts of saline prior to being administered.

My brother and his whole family took the jabs, and over the family, all US brands were received. The J&J recipient (24 yo, previously healthy) has had continual flu symptoms lasting for weeks at a time. Only stays 'well' for a few weeks then symptoms again. This has gone on nearly a year. The Moderna recipients (my brother and SIL) have had no adverse effects or illness and have had initial 2 shots and one booster. Both have co-morbidities (incl one a cancer survivor) but both appear to be without jab adverse effects. No word either way from the Pfizer (adult) daughter. Very difficult to get anywhere with dissuading them from more shots. I'm the 'crazy conspiracy nut' SIL.