

The ability to determine etiologies has improved over time.

The exact incidence of Fever of Unknown Origin is not well defined.Fever Without a Source may become Fever of Unknown Origin, if it lasts long enough.Fever of Unknown Origin involves a prolonged duration of fever.Often confused with “ Fever Without a Source”.Let us, now, look at Fever of Unknown Origin. On occasion though, the cause of the fever will not be clear, but the prolonged fever warrants concern. Additionally, we are aware of how important it is to avoid the “ It’s Just a Virus” statement. We also know there are “zebras” that may try to trample us (ex, Kawasaki’s, Myocarditis, Osteomyelitis, Acute Rheumatic Disease, Lemierre’s, and Cat Scratch Disease). We are all very accustomed to the common considerations (ex, UTI, Croup, Bronchiolitis, Appendicitis, and Sinusitis). Fever is one of the most common chief complaints in the Peds ED.
