What temperature is a fever dangerous?

Fever can be quite..: High and still be a normal reaction to an infxn. If by dangerous you mean malignant hyperthermia, this is generally not triggered by infection. Rather it most often follows anesthesia or neuromuscular blocker, and emerging data suggests predisposition related to mutations in many genes. For infxn-related fever, tylenol/motrin and supportive care. Should resolve w/ rx of infxn. If concerns, call dr.