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Fever: What’s Considered Low, High, and Possibly Serious?
A high fever in older children and adults is a temperature of 102.4 F or greater. Fevers above 105.8 F are termed "hyperpyrexia" and can be seen with brain dysfunction, severe infections ...
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When Is a Fever Too High?
Fevers are broadly categorized as being low-grade, moderate-grade, high-grade, and hyperpyrexia. A low-grade fever is defined as an oral temperature of 99.1 to 100.4 F (37.3 to 38 C) in adults.