BRUSSELS, April 21 — The European Medicine Agency (EMA) confirmed on Tuesday that there could be a link between Johnson & Johnson vaccines and very rare cases of blood clots, Anadolu Agency reported.

LONDON, April 15— People infected with Covid-19 are at a higher risk of developing the rare blood clotting known as cerebral venous thrombosis (CVT) than those who get a vaccine against the disease, a study published on Thursday by the University of Oxford, where the AstraZeneca vaccine was developed, said.