Average body temperature among healthy adults declined over the past two decades

In the nearly two centuries since German physician Carl Wunderlich established 98.6°F as the standard 'normal' body temperature, it has been used by parents and doctors alike as the measure by which fevers -- and often the severity of illness -- have been assessed.

from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/10/201028171432.htm