immunoglobulin G A class of immunoglobulins found in all body fluids. They are the smallest but most common antibodies (75 percent to 80 percent) in the body. Abbreviated IgG. IgG antibodies are very important in fighting bacterial and viral infections. IgG antibodies are the only type of antibody that can cross the placenta in a…
immunoglobulin E A class of immunoglobulins that includes the antibodies that are important in an allergic response. Abbreviated IgE. A person who has an allergy often has elevated blood levels of IgE. IgE antibodies attack and engage the invading army of allergens.
immunoglobulin D A class of immunoglobulins found in small amounts in the body, whose exact function is not clear.
immunoglobulin A A major class of immunoglobulins (antibodies) found in serum and external body secretions such as saliva, tears, and sweat, as well as in the gastrointestinal, respiratory, and genitourinary tracts. Abbreviated IgA. About 10 percent to 15 percent of the antibodies present in the body are IgA antibodies.
immunogenetics The genetics (pattern of inheritance) of the immune response. For example, immunogenetics includes the study of Rh, ABO, and other blood groups.
immunodepression See immunosuppression.
immunodeficient Lacking immunity, and so being susceptible to infection. Immunodeficient is the opposite of immunocompetent.
immunodeficiency The inability to form a normal immune response. Immunodeficiency can be due to a genetic disease or it can be acquired, as in AIDS.
immunocompromised Having an immune system that has been impaired by disease or medical treatment.
immunocompetent Able to develop an immune response. An immunocompetent body is able to recognize antigens and act against them. Immunocompetent is the opposite of immunodeficient.
immunization, varicella See chickenpox immunization.
immunization, serum hepatitis See hepatitis B immunization.