Table 4 Discrepancies on responses (yes to not sure, or no to not sure) between the HealthQuiz (HQ the Donor Health Assessment Questionnaire (DHAQ) among the 1239 study participants.

In the last 12 months have you had sex with someone who may have participated in high risk activities (sexual background uncertain)?

Have you had an AIDS test elsewhere (other than for donating blood)?

Had symptoms of AIDS?^*

Have you ever had yellow jaundice (other than at birth), hepatitis, or liver disease?

In the last 12 months to your knowledge have you come in close (intimate) contact with someone with yellow jaundice or hepatitis?

In the last 3 days have you taken any type of medicine or drugs, except birth control pills?

Have you taken Accutane or Tegison for a skin disorder or growth hormone (human pituitary)?

In the last month have you taken Accutane for a skin disorder, Proscar or Danazol?

Are you free from a cold, flu, infection or active allergy today?

Have you had a vaccination in the last 3 months or a rabies shot in the last year?

Have you had surgery in the last 6 months?

Have you had any of the following?

   Epilepsy, coma, stroke, repeated seizures or fainting

   Heart or blood pressure problems or heart surgery

   Cancer, diabetes, ulcerative colitis or Crohn's disease

   Kidney, lung or blood condition

Have you been pregnant in the last 6 months or breastfed in the last 3 months?

Have you ever had malaria?

In the last 3 years have you lived or visited an area where malaria is common?