<prompt> Which of the following statement is true?Paul Bunnel test is used to diagnosed measlesRose Waaler test is a complement fixation testIndirect hemagglutination test is less sensitive than gel diffusion testAntigen antibody reaction cannot occur in the absence of electrolytes  <response>: Paul Bunnel test is used to diagnose infectious mononucleosis Rose Waaler test is a passive hemagglutination test Indirect hemagglutination test is more sensitive than gel diffusion test Antigen antibody reaction cannot occur in the absence of electrolytes Ref: Ananthanarayan Panikers textbook of microbiology 9th Edition pg no.: 108,109,110,476, 