FDA Issues Authorization for Moderna COVID 19 Vaccine: What to Know FDA joins Europe in probing rare blood clots after Johnson J&J COVID 19 vaccine distribution restricted due to blood clot No, the FDA didn’t say the Pfizer COVID 19 vaccine causes blood clots Comparing the COVID 19 vaccines. Which vaccine will I get? What FDA joins Europe in probing rare blood clots after Johnson FDA restricts J&J’s Covid 19 vaccine due to blood clot risk The CDC and FDA Call for Pause on Janssen COVID 19 Vaccine Due to Rare AstraZeneca COVID 19 vaccine linked to rare blood clots, EMA