I remain uneasy about the J&J vaccine; they advertise the problem as 15 severe adverse reactions out of about 8 million vaccinations (original report 6 out of 7 million) but that isn’t the correct comparison, given the demographics of those who suffered this reaction. All were women and 13 were less than age 50 — and so you have to compare this to the total number of women in that age range who received the vaccine. It is misleading to continue to describe it as x out of total vaccinations; it significantly understates the risk of blood clots among younger women.