www.bloomberg.com/news/articles/2021-04-09/eu-regulator-investigating-blood-clots-after-j-j-covid-vaccine
Four serious cases of unusual clots accompanied by low blood platelets, one of which was fatal, have emerged after immunization with the J&J shot, the European Medicines Agency said Friday.
Adenovirus technologies such as that used by AstraZeneca and others have been associated with clotting in other settings, so if this is the reason for the rare side effects observed with the Astra vaccine, shots from J&J, Sputnik and Chinese drugmaker CanSino Biologics Inc. would also be at risk, said Sam Fazeli, an analyst with Bloomberg Intelligence.
A shame as the one-shot J&J was positioned as the ideal vaccine for younger people. If this really is an issue with the adenovirus vector in general then the world will just have to reckon with the rare side effects (mRNA vaccines are not going to be globally accessible due to cost, transportation and storage difficulties).