Johnson & Johnson's COVID-19 vaccine under scrutiny at EMA after 4 'serious cases' of unusual blood clots

AstraZeneca’s COVID-19 vaccine has dominated headlines as reports of rare blood clots mounted, but, now, European drug safety regulators are investigating potential clotting risks from Johnson & Johnson’s vaccine.

So far in the J&J vaccine’s U.S. rollout, EU officials have tracked three cases of unusual blood clots with low blood platelets following vaccination, the European Medicines Agency’s (EMA's) Pharmacovigilance Risk Assessment Committee said Friday. Another case came in a clinical trial. One of the cases was fatal.