COVID‑19 is a very serious disease with high hospitalization and death rates and every day COVID is still causing thousands of deaths across the EU. This vaccine has proven to be highly effective, it prevents severe disease and hospitalization, and it is saving lives. Vaccination is extremely important in helping us in the fight against COVID‑19 and we need to use the vaccines we have to protect us from the devastating effects". She went on to say "The PRAC after a very in-depth analysis has concluded that the reported cases of unusual blood clotting following vaccination with the AstraZeneca vaccine should be listed as possible side effects of the vaccine". At the same briefing Dr. Samina Strauss of PRAC confirmed "our conclusion is that these clotting disorders are very rare side effects of the vaccine".The UK Medicines and Healthcare products Regulatory Agency (MHRA) held a news conference on 7 April 2021, and while there is no proof that the AZD1222 vaccination caused the rare blood clots, they indicated the possibility of a link is getting stronger. The UK is to offer under 30s alternative vaccines. The reasoning is because in the 20-29 age range the benefits to individual of vaccination were less as their likelihood of harm from COVID‑19 is less and closer to the potential risk of harm from the vaccine (at a medium exposure risk with COVID‑19 infection cases running at a rate of 60 per 100,000).
"Thrombosis and Thrombocytopenia after ChAdOx1 nCoV-19 Vaccination". N Engl J Med. 384 (22): 2124–30. doi:10.1056/NEJMoa2104882. PMC 8112568. PMID 33835768. Scully M, Singh D, Lown R, Poles A, Solomon T, Levi M,  et al. (June 2021). "Pathologic Antibodies to Platelet Factor 4 after ChAdOx1 nCoV-19 Vaccination". N Engl J Med. 384 (23): 2202–11. doi:10.1056/NEJMoa2105385. PMC 8112532. PMID 33861525. External links
EMA press conference 7th April on YouTube