“…Five studies mentioned the need for human immunodeficiency virus testing [ 25 , 37 , 39 , 42 , 53 ]. Procalcitonin was tested in 10/89 (11%) studies as a marker suggestive of bacterial sepsis, although it cannot help to localize the site of infection [ 18 , 30 , 34 , 38 , 41 , 52 , 62 , 65 , 66 , 75 ]. Bone marrow examination and biopsy of lesions or lymph nodes were used to rule out malignancy or HLH [ 41 , 44 – 46 , 50 – 53 , 62 , 74 , 76 ].…”