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Programs that administer tests which identify individuals who have been exposed to hepatitis A, B or C by detecting the presence of associated antigens, antibodies or genetic material (DNA). Hepatitis is an inflammation of the liver caused by a variety of agents including viral infection (hepatitis A virus, hepatitis B virus, hepatitis C virus and delta agents), bacterial invasion and physical and chemical agents. Hepatitis A and delta agent hepatitis are spread primarily from person to person via the fecal-oral route, but may occur by contact with water or food contaminated by the virus. Hepatitis B and C are spread by blood and serum-derived fluids and by direct contact with body fluids. Depending on the type of hepatitis involved, screening may be particularly recommended for persons who have traveled or worked in countries with high rates of infection, sexually active homosexual men, injecting and non-injecting illegal drug users, persons who work with infected primates in a laboratory setting, persons with chronic liver disease, persons with clotting disorders, blood bank and dialysis workers, dental hygienists, and other members of health care teams who come into contact with blood, body fluids or body tissue.