Infectious MononucleosisHerpesvirus 4, HumanAntibodies, HeterophileEpstein-Barr Virus InfectionsAntibodies, ViralImmunoglobulin MHemagglutination TestsEpstein-Barr Virus Nuclear AntigensAgglutininsLymphoproliferative DisordersSplenic RuptureHerpesvirus VaccinesAntigens, ViralOropharynxHerpesviridae InfectionsLymphocytesBurkitt LymphomaSerologic TestsHodgkin DiseaseLymphocytosisFluorescent Antibody TechniqueAcute DiseaseHerpesviridaeReed-Sternberg CellsCytomegalovirus InfectionsI Blood-Group SystemFatigue Syndrome, ChronicAntigens, HeterophileCytomegalovirus