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Originally posted by mattifikation
Old immunities don't matter. Whatever immunities you have right now, they don't help you one bit against Swine Flu. Your blood type doesn't matter, being in good health doesn't help you (in fact, it may harm you,) and having had every other version of the flu that's out there won't help your immunity either.
That's the whole point behind the Swine Flu scare. That's why it's such a threat: There are no previous cases of this particular strain, so there is no previously existing immunity.
Originally posted by eradown
Something else to consider, if the goal of H1N1 is to reduce the population, O positive is the most common blood type on earth.
Individuals with type O blood do not produce ABO antigens. Therefore, their blood normally will not be rejected when it is given to others with different ABO types. As a result, type O people are universal donors for transfusions, but they can receive only type O blood themselves. Those who have type AB blood do not make any ABO antibodies. Their blood does not discriminate against any other ABO type. Consequently, they are universal receivers for transfusions, but their blood will be agglutinated when given to people with every other type because they produce both kinds of antigens.