The immune-boosting power of a fever is surprisingly ancient. Cold-blooded creatures like fish typically move to warmer environments to help fight infections. In one fish species, Nile tilapia ...

Average body temperature is around 98.6° F (37.0° C) A fever is an elevated body temperature with these readings: Rectal, Forehead or Ear temperature: 100.4° F (38.0° C) or higher Oral (mouth) ...

The same applies to older adults who may have a dry cough with no fever but experience sudden changes in their mental status, including confusion, disorientation, and delirium. American Lung ...

Reactions to a recent immunization (vaccine) Most are reactions at the shot site (such as pain, swelling, redness) General reactions (such as a fever or being fussy) may also occur ...