It may be rare but Johnson & Johnson (et al) producing clots ?

Tell us in the UK about it! Stanley Johnson & his missus did it 60 years ago.

One of the great unknowns is the rate of problems in the general public is masked by the great messy thing that is life. In a time of mass vaccinations there is far more visibility on the health of those vaccinated. Whereas, in life without mass vaccinations some cases will go unnoticed. Or described as TIAs or alcoholism black-outs. Etc.