London hospitals face blood shortage after Synnovis ransomware attack

England’s NHS Blood and Transplant urgently requested O Positive and O Negative donors after a ransomware attack on pathology provider Synnovis—attributed to the Qilin/Agenda group—disrupted multiple London hospitals, impaired blood-type matching, led to cancelled or redirected non-urgent procedures, and caused critical shortages of universal donor blood while recovery efforts are ongoing.