One particular blood type is most needed.
Blood donation saves lives An urgent appeal has been launched for blood donations following the cyberattack on major London hospitals. NHS Blood and Transplant is asking for O blood type donors to book appointments following the critical incident which has left affected hospitals unable to match patients’ blood as quickly as usual. Operations and other procedures have been postponed as a result of the attack.
If a person with A type blood receives type B blood, the A antibodies in the plasma will attack and destroy the blood cells. However, in 1940, scientists Karl Landsteiner and Alexander Wiener discovered that in some cases a blood transfusion of the same type could still cause a severe reaction. This was found to be due to another antigen, D, or the rhesus factor.
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