Principles of Disease and Epidemiology 。Pathology Study of disease 。Etiology Study of the cause of a disease 。Pathogenesis Development of disease 。Infection Colonization of the body by pathogens Disease An abnormal state in which the body is not functionally normallyPrinciples of Disease and Epidemiology • Pathology Study of disease • Etiology Study of the cause of a disease • Pathogenesis Development of disease • Infection Colonization of the body by pathogens • Disease An abnormal state in which the body is not functionally normally