10. Presence of positive test results in HIV antibodies, Hepatitis B surface antigen, or Hepatitis C antibodies (Rationale: Correlative biologic studies entail aerosolization of biologic fluids. Researchers use Universal precautions and should be protected from HIV or Hepatitis viruses. However, robotic equipment handling specimens with high viral load would require purging and sterilization procedures that could damage the equipment or alter results for subsequent specimens. Patients lacking symptoms or signs of HIV or hepatitis have low viral loads so that screening for them is not necessary).