O, A, B, and AB are the four most common blood types. Antigens and antibodies are both widely dispersed in the population at large. Antibodies against blood group A and B antigens can also be found in plasma.
When it comes to blood types, those with blood group A have B antigen in their red blood cells and anti-A antibodies in their plasma, while those with blood type O have the opposite. In contrast to those with blood type O, who lack antigens in their plasma but are resistant to A and B infections, those with blood type AB, who lack antibodies but are vulnerable to A and B infections, have no defenses against these infections.
The greatest benefit will be seen by those with blood type O. As a matter of course, O-negative blood is transfused to patients of other blood types. This group can socialize freely with members of other groups because they do not have to worry about contracting diseases from them. Someone with this blood type is likely to be very ambitious and hard-working.
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Those with blood type O, for instance, can only receive transfusions from others of the same blood group. Finding a donor can be difficult if you've recently been in an accident and need a transfusion but the hospital doesn't have a blood bank. As a bonus, they produce large quantities of acids that are harmful to human health. Finally, those with blood group O are at a higher risk for developing ulcers, having their thyroids damaged, and having trouble producing adequate synthetic thyroid hormones.