Traditionally, cases of disease or health conditions were reported to surveillance systems by clinically-based physicians; however, many surveillance systems now rely on information provided by other health professionals as well such as nurses, infection control specialists, and public health practitioners in hospitals, laboratories, school and occupational settings, and nursing homes. In general, the most complete surveillance systems consist of multiple reporting sources, only some of which are included here. Summaries of surveillance information should be provided to these types of individuals and groups who report case information to your surveillance system.