<prompt> The following methods of diagnosis utilize labelled antibodies except -ELISA Enzyme Linked Immunosorbent AssayHemagglutination inhibition testRadioimmunoassayImmunofluorescence  <response>: Hemagglutination inhibition offers a convenient method for the detection and quantitation of the antibody to the virus. Labeled antibodies are not used. RIA uses labeled antibody, ELISA uses enzyme-linked antibody and immunofluorescence use fluorescent lalabeledntibody. Reference : Anathanarayan panikers 9th edition, pg no:113, 116,501 p 