HLA Antigens: Proteins on the outer part of the cell that help the body fight illness. These proteins vary from person to person. Scientists think that people with certain types of HLA antigens are more likely to develop insulin-dependent diabetes.

Immunity: State of being resistant to a disease, particularly an infectious one.

Incubation: The time between infection by a pathogen and the appearance of disease symptoms.

Leprosy: A skin infection caused by a bacterium, which can also be associated with nerve damage. The bacterium involved is called Mycobacterium leprae.

Lymph node: Round, oval or bean-shaped aggregation of infection- and cancer-fighting immune cells located along the lymph channels throughout the body.

Multi drug therapy: use of a combination of drugs to cure a disease