There is no risk of thrombosis or blood clotting due to use of Covishield, Niti Aayog member-health Dr V K Paul said on Wednesday and urged people to get vaccinated without any fear. This comes in the wake of concerns about possible adverse events in people vaccinated with Covishield, a vaccine developed by Oxford University and AstraZeneca.There is no risk of thrombosis or blood clotting due to use of Covishield, Niti Aayog member-health Dr V K Paul said on Wednesday and urged people to get vaccinated without any fear. This comes in the wake of concerns about possible adverse events in people vaccinated with Covishield, a vaccine developed by Oxford University and AstraZeneca.