Classifying Infectious Diseases ·Symptom A change in body function that is felt by a patient as a result of disease Sign A change in a body that can be measured or observed as a result of disease. 。Syndrome A specific group of signs and symptoms that accompany a disease. Classifying Infectious Diseases • Symptom A change in body function that is felt by a patient as a result of disease • Sign A change in a body that can be measured or observed as a result of disease. • Syndrome A specific group of signs and symptoms that accompany a disease