This is the "Disgust Response." It is a behavioral immune system. While fear makes us run away, disgust makes us recoil. It protects us from eating spoiled food or touching the infected dead.
The Fall.
Psychologists define primal fear as an innate emotional response programmed into our neurobiology. These are "factory-equipped" survival mechanisms that trigger the sympathetic nervous system, preparing the body for a fight-or-flight response long before the conscious mind can process the danger. The Survival Instinct primal fears