British-Swedish drugmaker AstraZeneca said there is no scientific evidence to back claims that its coronavirus disease 2019 (Covid-19) vaccine, AZD1222, triggered blood clotting or pulmonary embolism.

It gave the assurance after several countries in the European Union suspended the use of AZD1222, which was co-developed with the University of Oxford, following reports of blood clotting among those who had been vaccinated.