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Antibodies produced in response to a foreign antigen, do not go away. They sometimes lose titer( strength) and may be below a detectable limit. Every blood bank will continue to give negative blood for the corressponding antigen as long as they have the information available. If you have been told you have certain antibodies, I suggest you keep a card or list on your person and give it to a hospital or keep it in your wallet, so the infromation can be passed to the Transfusion Service. Although they will always perform their own work-up, the infromation can be invaluable.
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