Blood Transfusions

In modern day, blood transfusions are needed for those who have been in horrific accidents, suffer from a certain disease, or are going through surgery. Certain types of blood are required for each patient and tests are regularly performed on all imported blood. Viruses such as HIV, Hepatitis, and Malaria that are carried through the blood must not be able to reach the blood stock. Due to strict procedures blood transfusion goes through, wrong blood types hardly occur except in rare cases. If blood is transmitted into a patient but his blood is not compatible with the donated blood, there is a slim chance a life threatening reaction may occur. However, the odds of a blood transfusion gone wrong are in the thousands, but I would like to see that number reach as close to zero as possible.