It was Pfizer. I'm not sure if it was technically a booster, though. I had one vaccination a year earlier (early 2021), but don't recall the maker. Also, I had the Delta variant of Covid in July 2021. It was nightmare. Fever 104° for 6 days/nights. Delirium. I was alone the entire time...no visitors. Two weeks into it, I was pretty much incoherent most of time. But I could tell that my arms and legs were twice the normal size and bulging veins all over. Very painful. Had a gut feeling that this symptom could mean death, but no idea what was happening. Finally drove myself to ER ( again...had gone 7 days before, but before this symptom). Anyway, turns out I had 9 blood clots (in all extremities) + pulmonary embolism in each lung + plus double pneumonia. The point is that vaccine didn't stop the virus from kicking my butt.