infectious diseases
Immunologic Tests for Infectious Disease
Enzyme immunoassays
Enzyme immunoassays use antibodies linked to enzymes to detect antigens and to detect and quantify antibodies. Examples are Enzyme immunoassay (EIA) Enzyme-linked immunosorbent assay (ELISA) Because sensitivities of most enzyme immunoassays are high, they are usually used for screening. Titers can be determined by serially diluting the specimen as for agglutination tests. Test sensitivities, although usually high, can vary, sometimes according to patient age, microbial serotype, specimen type, or stage of clinical disease. 