The Johnson and Johnson vaccine was seen to have "rare" blood clot occurrence. Because of this, a European drug regulator is reviewing the blood clots among four Americans who received the said vaccines. It can be remembered that AstraZeneca vaccines were suspended in several countries from the European Union such as France, Portugal, and Germany because the said vaccine also formed blood clots on some of their constituents. Meanwhile, Johnson and Johnson noted that they are aware of the blood clot occurrence from their vaccine and are working with regulators. Blood Clot After J&J Jab The Safety Committee from the European Medicine's Agency (EMA) is the one who is investigating the blood clot occurrence on four Americans who received the jab, according to a report from Reuters.