Blood Group II

Blood group II (A) differs from others by the presence of antigen A on the surface of red blood cells. Positive red blood cells can easily attach to platelets and form strong bonds with them, which is useful for sealing damage. Typically, these people tolerate gastrointestinal infections well. However, their blood is not suitable for direct transfusion to people with other blood types. They can produce antibodies against the recipient's blood, which can cause