A public health supervisor deals with epidemiological tasks that consist of the organisation of public health investigations and the analysis of data retrieved during the investigations. Graduated public health supervisors have a deep knowledge of the theory and practice of hospital hygiene, the epidemiology of hospital-acquired infections, the methodology of disinfection and sterilization, as well. They plan and realize nosocomial surveillance, monitor the health status of the population, plan, organize, realize and evaluate preventive programmes. They are able to participate in planning and delivering policies and programs, that aim to influence the health of groups of people at local, regional and national levels.