Hemagglutination Assay t buffer virus dilution RBc(approx. 105) ◎ 1:4 + virus|oo° buffer 1:2048 1:4096 Hemagglutination assayHemagglutination Assay + buffer + virus dilution + RBC (approx. 10 5) 1:4 … + virus + buffer … … 1:2048 1:4096 Hemagglutination assay