The investigation of illness transmission is the examination and assessment of the course, models and determinants of prosperity and ailment conditions in portrayed peoples. It is an establishment of general prosperity, and shapes methodology decisions and evidence based practice by perceiving risk factors for disease and centers for preventive social protection. The investigation of infection transmission is the examination of ailments in masses of individuals or various animals, unequivocally how, when and where they occur. Malady transmission authorities try to make sense of what parts are connected with ailments chance factors, and what components may guarantee people or animals against ailment protective components.