April 14, 2021
The CDC and the FDA are reviewing data involving six U.S. cases of a rare type of blood clot in individuals after receiving the Johnson & Johnson (J&J) COVID-19 vaccine that were reported to the Vaccine Adverse Events Reporting System (VAERS).
In these cases, a type of blood clot called cerebral venous sinus thrombosis (CVST) was seen in combination with low levels of blood platelets (thrombocytopenia). All six cases occurred among women aged 18–48 years. The interval from vaccine receipt to symptom onset ranged from 6–13 days. One patient died. Read more.