CRP and infectious mononucleosis: UPCR: urine protein-to-creatinine ratio; WBC: white blood cells; RBC: red blood cells; MCV: mean corpuscular volume; MCHC: mean corpuscular hemoglobin concentration; LDH: lactate dehydrogenase; CRP: C-reactive protein; ANA: antinuclear antibodies; ANCA: anti-neutrophil cytoplasmic antibodies; GBM: glomerular basement membrane; PCR: polymerase chain reaction; HIV: human immunodeficiency virus; HBs: hepatitis B surface antigen; HBc: hepatitis B core antibody; HCV: hepatitis C virus; CMV: cytomegalovirus; IM: infectious mononucleosis