Zero Incidence is not seen in

Control of infection: The reduction of disease incidence, prevalence, morbidity or moality to a locally acceptable level as a result of deliberate effos; continued intervention measures are required to maintain the reduction. Example: diarrhoeal diseases.Elimination of disease: Reduction to zero of the incidence of a specified disease in a defined geographical area as a result of deliberate effos; continued intervention measures are required. Example: neonatal tetanusElimination of infections: Reduction to zero of the incidence of infection caused by a specific agent in a defined geographical area as a result of deliberate effos; continued measures to prevent re-establishment of transmission are required. Example: measles, poliomyelitis.Eradication: Permanent reduction to zero of the worldwide incidence of infection caused by a specific agent as a result of deliberate effos; intervention measures are no longer needed. Example: smallpox.