*Men who have had sexual contact with other men since 1977
*Anyone who has ever received clotting factor concentrates
*Anyone with a positive test for HIV (AIDS virus)
*Men and women who have engaged in sex for money or drugs since 1977
*Anyone who has had hepatitis since his or her eleventh birthday
*Anyone who has had babesiosis or Chagas disease
*Anyone who has taken Tegison for psoriasis
*Anyone who has risk factors for Crueutzfeldt-Jakob disease (CJD) or who has an immediate family member with CJD
*Anyone who has risk factors for vCJD
*Anyone who spent three months or more in the United Kingdom from 1980 through 1996
*Anyone who has ever used intravenous drugs (illegal IV drugs)