Immunization, Vaccines and Biologicals

Accelerated Disease Control

National Active

Active surveillance involves visiting health facilities, talking to health-care providers and reviewing medical records to identify suspected cases of disease under surveillance. Designated active surveillance staff regularly visit health facilities in person to search for suspected cases among persons who might have attended the facility. It involves physical review of medical records and registers, interviews with health workers and visits to relevant outpatient clinics and hospital wards. When a case is found, the active surveillance staff investigate it, document clinical and epidemiological data, arrange to send appropriate laboratory specimens and report the information rapidly, according to national policy. This method is usually used when a disease is targeted for eradication or elimination, when every possible case must be found and investigated. It is also used for outbreak investigations.

Selected diseases