Infectious disease (22%)
EBV
UTI
Enterovirus
Lyme
Cat-scratch disease
Osteomyelitis
Psittacosis
Rheumatic fever
Crohn's
Bacterial meningitis
Autoimmune (6%)
JRA
SLE
PAN
Malignancy (2%)
Leukemia
Lymphoma
Drug-induced fever (2%)
Factitious (2%)
No Etiology  (67%)
EBV
UTI
Enterovirus
Lyme
Cat-scratch disease
Osteomyelitis
Psittacosis
Rheumatic fever
Crohn's
Bacterial meningitis
JRA
SLE
PAN
Leukemia
Lymphoma
Fever of unknown origin
Infectious disease 
Acute fever
EBV
Neutropenic fever
UTI
Q fever
Enterovirus