The cyber attack has caused a number of procedures to be cancelled or changed with blood transfusions particularly affected. The NHS Blood and Transplant Service has launched an urgent appeal for O blood-type donors
The ransomware attack has caused difficulties across King's College Hospital, Guy's and St Thomas', including the Royal Brompton and the Evelina London Children's Hospital, and primary care services. It has left hospitals unable to match patients' blood as quickly as they previously could.
NHS Blood and Transplant is now calling for all O-Positive and O-Negative donors to book appointments in one of London's 25 NHS donor centres to boost stocks.
As blood has a shelf life of 35 days, and surgeries and procedures require blood to take place, stocks need to be continually replenished. You can find your local blood donation centre here