> "Why is everyone worried about blood clots, and not that the J&J vaccine has a crap-tastic efficiency of 66.3%?" The J&J vaccine is marketed as a single-dose

> "Why is everyone worried about blood clots, and not that the J&J vaccine has a crap-tastic efficiency of 66.3%?" The J&J vaccine is marketed as a single-dose vaccine, unlike the others which all require two doses to reach their reported efficacy. Single-dose is a massive advantage which will greatly speed up vaccination progress, especially in developing countries. And 66% seems pretty good for a single dose.