Control

• The reduction of disease incidence, prevalence, morbidity or mortality to a locally acceptable level as a result of deliberate efforts;
• Continued intervention measures are required to maintain the reduction.

Elimination

• Reduction to zero (or a very low defined target rate) of new cases of an infectious disease in a defined geographical area as a result of deliberate efforts
• Continued measures to prevent re-establishment of transmission are required.

Elimination requires continued measures to prevent re-establishment of disease transmission.

Eradication

• The complete and permanent worldwide reduction to zero new cases of an infectious disease through deliberate efforts.
• No further control measures are required.

If a disease has been eradicated, no further control measures are required.