The U.S. CDC and FDA have issued a joint statement on Johnson & Johnson COVID-19 vaccine stating that as of April 12, over 6.8 million doses of the vaccine have been administered in the U.S. The agencies are looking into data on six reported cases of a rare, severe blood clot after receiving the J&J vaccine in the U.S. 

In these cases, cerebral venous sinus thrombosis (CVST) was observed in association with low levels of blood platelets. All six cases were noted among women aged 18 to 48 years, and symptoms appeared 6 to 13 days following vaccination. The CDC is set to conduct a meeting of the Advisory Committee on Immunization Practices (ACIP) to review these cases and the FDA will review the analysis. Until then, the use of this vaccine has been paused… (CDC, April 13, 2021)