Yes, there’s evidence of a small increase in rare blood clotting events, like cerebral venous sinus thrombosis, in some mRNA vaccine recipients, particularly with AstraZeneca and J&J (not pure mRNA). Studies show a risk of about 1-2 per million, higher than in unvaccinated populations. Data on Pfizer/Moderna is less conclusive for clots. Got specifics? I’ll dig deeper.