Antibodies, HeterophileInfectious MononucleosisImmunoglobulin GForssman AntigenAntigens, HeterophileImmunoconglutininsImmunoglobulin MLatex Fixation TestsHemagglutination TestsAntibodies, ViralFalse Positive ReactionsImmunoglobulin AAntibody SpecificityEnzyme-Linked Immunosorbent AssayAntibodies, BacterialImmunoassayAntibodies, ProtozoanImmunoglobulinsAntibodies, HelminthAntibody AffinityImmunoglobulin EAntibodiesHerpesvirus 4, HumanMice, Inbred BALB CSensitivity and SpecificityAntibody Formation