U.S. Seeks to Pause J&J Covid-19 Vaccine Use After Rare Blood-Clot Cases

6 bloot clot cases in more than 6.8 million doses.

In the case of J&J’s shot, six women ages 18 to 48 developed blood clots after taking the J&J vaccine, the FDA and CDC said. The clots developed 6 to 13 days after vaccination. The women also had in their blood low counts of platelets, which help with clotting.