File photo dated January 20, 2020 of AstraZeneca logo during a visit at the AstraZeneca factory in Dunkirk, northern France. AstraZeneca has paused all clinical trials of the Covid-19 vaccine it is developing with Oxford university after a participant in the UK arm of the study suffered a suspected serious adverse reaction. The UK-based drugmaker voluntarily put the trial on hold after the discovery of the sick participant. AstraZeneca said it was working to review the event to ensure it would not result in a significant delay to the study. Photo by Raphael Lafargue/ABACAPRESS.COM (Lafargue Raphael/ABACA / IPA/Fotogramma, Dunkirk - 2020-09-09) p.s. la foto e' utilizzabile nel rispetto del contesto in cui e' stata scattata, e senza intento diffamatorio del decoro delle persone rappresentate