Health Surveillance TeutschSM & Churchill RE (eds). Principles and Practice of Public Health Surveillance, 2nded.Oxford University Press, 2000. Ongoing, systematic collection, analysis, interpretation and dissemination of health-related data essential for public health practice (i.e. prevention and control of disease). Surveillance applies to both human and vetiranary diseases, may be general or sentinal, and may be active or passive. Surveillance may be for health events (such as deaths or disease), health services (vaccinations, hospital admissions), health behaviors (smoking, alcohol), or even risk factors (water supply, travel). Salwa Ali planned process