Over 6.8 million Americans have received the Johnson & Johnson COVID-19 vaccine, which is now facing renewed scrutiny after six of those recipients developed a rare, severe type of blood clot that has caused the FDA and CDC to recommend a pause in the rollout. But for those millions who have already received the one-shot vaccine, what does that mean? According to the FDA, all six cases involved women between the ages of 18 and 48, and the symptoms occurred six to 13 days post-vaccination. The blood clot, called cerebral venous sinus thrombosis, which was seen in combination with low levels of blood platelets, is treated differently than other clots. The agency now recommends that people who have received the Johnson & Johnson vaccine and develop severe headache, abdominal pain, leg pain, or shortness of breath within three weeks after inoculation contact their health care provider.
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