Case Study#1   1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19   Work-up for infection: Blood cultures: repeatedly negative Nasophayngeal cultures: negative Central line cultures: negative Urine cultures: negative Stool cultures: repeatedly normal flora 4+ Stool clostridium difficile toxin: repeatedly negative Stool: no virus isolated, parasites: negative HIV antibodies: negative PPD: negative EBV serology: EBV-VCA IgG: + EBV-VCA IgM: - EBNA:+ Monospot: - CMV serology: IgG-, IgM:- CMV antigenemia and culture: repeatedly negative