نبذه عن الكتاب: The aim of The ELISA Guidebook is to expand the information concerning enzyme-linked immunosorbent assay (ELISA) published in ELISA: Theory and Practice by J. R. Crowther (1995), in the Methods in Molecular Biology series by Humana Press (vol. 42). The earlier book concentrated on the immunological background of the reagents exploited in such assays, and dealt practically with the various assays, through examples using noninfectious systems. This new volume is a major extension and updating of that book, with a reorganization of the chapters, and extra information dealing, in particular, with chessboard titration of reagents, quality control, monoclonal antibodies, validation of assays, statistics, and epidemiological considerations. Suitable for scientists with previous experience of the technique, it can, however, be used successfully by those with little experience, and as a teaching aid. The ELISA Guidebook deals with heterogeneous enzyme-linked immunosorbent assays. The abbreviation ELISA, or in the plural ELISAs, will be used from now on to denote this kind of assay. Besides the inherent feature of all ELISAs¡ªthat there is an enzyme linked to one of the reagents¡ªheterogeneous assays involve the attachment of one reagent to a solid phase and subsequent addition of reagents that bind. The separation of bound and free components is necessary through washing steps. Such assays must be distinguished from homogeneous ELISAs, in which reagents are added simultaneously