A vaccination that gives short-term protection against hepatitis B.

A term that refers to antibody production. The aspect of immunity that is mediated by secreted antibodies that are produced by B cells. Secreted antibodies bind to antigens, flagging them for destruction.

A birth defect in which the anal canal fails to develop. The condition is treated with an operation.

Irritation of the colon caused by decreased blood flow. It may cause bloody diarrhea.

The spasm of the muscles of the larynx, resulting in airway constriction.

A tear in the lower end of the esophagus caused by severe vomiting.

A common, often

Two or more amino acids joined by a peptide bond.

A chronic liver disease that slowly destroys the bile ducts in the liver, preventing the release of bile. Long-term irritation of the liver may cause scarring and cirrhosis in later stages of the disease.

The opening from the stomach into the top of the small intestine (duodenum).