WHO surveillance is done in all EXCEPT

(Relapsing fever) (115,204, Park 20th)SURVEILLANCE - defined as "the continuous scrutiny of all aspects of occurance and spread of disease that are pertinent to effective control"* The ultimate objective of surveillance is prevention* International surveillance: At the international level, the WHO maintains surveillance of important disease (eg. Influenza, malaria, polio etc) and gives timely warning to all national governments* Under the Intemation Health Regulations- cholera is notifiable to the WHO within 24 hours of its occurance by the National Government* Kaplan Meier estimator (Product limit estimator) method is used for survival*** "STEPS' is recommened by WHO as a method for surveillance of risk factor for non communicable disease*** Criteria suguesting casualitv in non communicable diseases (causal relationship)1. Temporal association*2. Strength of association*3. Specificity of the association *4. Consistency of the association5. Biological plausibility6. Coherence of the association* Case fatality rate is a good index of the severity of an acute disease and represents the killing power of the disease.