disease has feature disease has infectious agent Splenomegaly Lymphadenopathy Epstein-Barr virus infection infectious mononucleosis https://www.malacards.org/card/pfeiffer_syndrome icd11.foundation:760139952 NANDO:2200976 Gammaherpesviral mononucleosis MESH:D007244 A condition characterized by an increase in mononuclear white blood cells and swollen lymph nodes, which is usually caused by infection with the Epstein-Barr virus. glandular fever NANDO:1200668 MONDO:0005810 Mono ICD9:075 NCIT:C34726 ICD10WHO:B27 EFO:0007326 SCTID:186668002 DOID:8568 UMLS:C0021345 MEDGEN:7069 human gammaherpesvirus 4