<prompt> The development of a color reaction is indicative of a positive result in which of the following assay?ImmunofluorescenceFlow cytometryRadioimmunoassayEnzyme- linked immunosorbent assay  <response>: ELISA is used routinely for screening patient sera for many different antibodies . Types :- 1. Indirect ELISA - uses color reaction. 2. Sandwhich ELISA - home pregnancy tests 3. Competitive ELISA- ability to give results for cruder or samples. -Uses Enzyme linked Antigen rather than Enzyme linkedAntibody. -For detection of HIV Antibody. 