The term fever of unknown origin (FUO) is best reserved for children with a fever documented by a health care provider and for which the cause could not be identified after 3 wk of evaluation as an outpatient or after 1 wk of evaluation in hospital.
Nelson Text Book 18thEdition
Ergönül O, Willke A, Azap A, et al. Revised definition of ‘fever of …
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Exanthems – eruption of skin accompanied by inflammation.
Enanthems – eruption of mucous membrane.
Maculopapular rashes :
CMV and HBV
Erythema Multiforme due to Herpes virus, EBV, Adeno virus, Chlamydia, Salmonella, Mycobacteria, Histoplasma, Coccidiosis
Nodular rashes :
Erythema Nodosum – Streptococcus, Mycobacteria, Yersinia, HCV, Sarcoidosis, Drugs and IBD
Diffuse erythematous with peeling or desquamation :
Toxic shock …