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banned from giving blood
Pretty extensive list: People banned from donating blood
# People who have used intravenous drugs (illegal IV drugs)
# Men who have had sexual contact with other men since 1977
# People who have received clotting factor concentrates
# People with a positive antibody test for HIV (AIDS virus)
# Men and women who have engaged in sex for money or drugs since 1977
# People with hepatitis since his or her eleventh birthday
# People who have had babesiosis (tick-borne malaria like illness or Chagas (parasitic infection) disease
# People who have taken Tegison for psoriasis, removed from approved drug lists in the US because of reports of severe birth defects
# Anyone with risk factors for Crueutzfeldt-Jakob disease (CJD) or who has an immediate family member with CJD
# People with risk factors for vCJD
# Anyone who spent three months or more in the United Kingdom from 1980 through 1996
# Anyone who has been to Europe from 1980 to the present.If you have been to Europe from 1980 to the present, you are ineligible to donate blood through 17 May 2004. After 17 May, you will be able to donate blood as long as you were not in UK for more than 3 months, or 6 months in Eastern / Western Europe between the 1980 to present timeframe.
Source: American Association of Blood Banks