Group Discussion on:SURVEILLANCEPrepared By
WHAT ISTHE DEFINITIONOF SURVEILLANCE …?
DEFINITIONS OF SURVEILLANCE• “The continued watchfulness overthe distribution and trends ofincidence through the systemati...
DEFINITIONS OF SURVEILLANCE• “Surveillance serves as thebrain and nervous systemfor programs to preventand control disease...
DEFINITIONS OF SURVEILLANCE“Systematic ongoingcollection, collation and analysisof data and the timelydissemination of inf...
KEY ELEMENTS1. Collection of health data expressly foruse in health planning, disease control/prevention, and/or health pr...
What AreTHE TYPESOF SURVEILLANCE…?
Uses of SurveillanceOutbreaksDetectionHuman DiseasesZoonotic DiseasesFood SafetyDrug resistanceOrganismsMonitor Changes or...
10Stepsoutbreakinvestigation1.Prepare to investigate.2. Verify the diagnosis and confirm outbreak.3. Case definition.4. Ca...
6. Hypothesis generation—the how and thewhy.7. Evaluate hypothesis thorough statistics.8. Additional environmental studies...
EVALUATION …. OfSURVEILLANCE SYSTEM
SURVEILLANCE SYSTEMEVALUATIONSensitivityTimelinessRepresentativenessPredictive valuepositiveAcceptabilityFlexibilitySimpli...
SURVEILLANCE SYSTEMEVALUATION• What proportion of“cases” areidentified?• Does the system givean accurate picture oftrends ...
SURVEILLANCE SYSTEMEVALUATION• TimelinessIs information disseminatedrapidly enough to permit timelyaction based on the sur...
SURVEILLANCE SYSTEMEVALUATION• Representativeness• Do reported casesdiffer from unreportedcases?
SURVEILLANCE SYSTEMEVALUATION• Positive predictivevalue• What proportion ofthose identifiedactually have thedisease or fac...
SURVEILLANCE SYSTEMEVALUATION• Acceptability• Does the system stimulatethe cooperation ofrespondents?• Does the processdis...
SURVEILLANCE SYSTEMEVALUATION• Flexibility• Can changes be easily made inthe system to reflect changesin trends, magnitude...
SURVEILLANCE SYSTEMEVALUATION• Simplicity• Can the system be simplifiedand still obtain the necessaryinformation?
SURVEILLANCE SYSTEMEVALUATION• Cost/benefit• Is the system worth the cost?• Can costs be reduced withoutsacrificing the es...
SURVEILLANCE SYSTEMEVALUATION• Dissemination ofresults• To decision-makers• To data collectors• To the general public
SURVEILLANCE SYSTEMEVALUATION• Appropriateaction taken• Are appropriate actionstaken in response to thesurveillance data?•...
Comparison WithInternational Standards• Use of electronic notification system.• Category of reported cases.• Using of dise...
Comparison With InternationalStandards• Monitoring circulation of organisms.• Awareness about the surveillance.• Giving fr...
Surveillance
Surveillance
Surveillance
Surveillance
Surveillance
Surveillance
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Surveillance

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Surveillance

  1. 1. Group Discussion on:SURVEILLANCEPrepared By
  2. 2. WHAT ISTHE DEFINITIONOF SURVEILLANCE …?
  3. 3. DEFINITIONS OF SURVEILLANCE• “The continued watchfulness overthe distribution and trends ofincidence through the systematiccollection, consolidation, andevaluation of morbidity andmortality reports and otherrelevant data, together withdissemination to those who need toknow.”LANGMUIR, 1963
  4. 4. DEFINITIONS OF SURVEILLANCE• “Surveillance serves as thebrain and nervous systemfor programs to preventand control disease.”D.A. HENDERSON, 1976
  5. 5. DEFINITIONS OF SURVEILLANCE“Systematic ongoingcollection, collation and analysisof data and the timelydissemination of information tothose who need to know so thatthe actioncan be taken”WHO 2001
  6. 6. KEY ELEMENTS1. Collection of health data expressly foruse in health planning, disease control/prevention, and/or health promotion.2. Ongoing collection of data.3. Timely analysis.4. Easily understood.5. Dissemination of results.6. Action based on results.7. Periodic evaluation of the system.(Detels, 1989)
  7. 7. What AreTHE TYPESOF SURVEILLANCE…?
  8. 8. Uses of SurveillanceOutbreaksDetectionHuman DiseasesZoonotic DiseasesFood SafetyDrug resistanceOrganismsMonitor Changes ortrends in heathfactorsDisease burdenEmergingdiseasesGeographicdistributionRisk groupdistributionHealth informationfor interventionprogramsEvaluate effectivenessof interventionstrategies.
  9. 9. 10Stepsoutbreakinvestigation1.Prepare to investigate.2. Verify the diagnosis and confirm outbreak.3. Case definition.4. Case finding.5. Perform descriptive epidemiology.
  10. 10. 6. Hypothesis generation—the how and thewhy.7. Evaluate hypothesis thorough statistics.8. Additional environmental studies.9. Implement control/prevention measure.10. Communicate findings.10Stepsoutbreakinvestigation
  11. 11. EVALUATION …. OfSURVEILLANCE SYSTEM
  12. 12. SURVEILLANCE SYSTEMEVALUATIONSensitivityTimelinessRepresentativenessPredictive valuepositiveAcceptabilityFlexibilitySimplicityCost/benefitDisseminationof resultsAppropriateaction taken
  13. 13. SURVEILLANCE SYSTEMEVALUATION• What proportion of“cases” areidentified?• Does the system givean accurate picture oftrends andmagnitudes?• Sensitivity
  14. 14. SURVEILLANCE SYSTEMEVALUATION• TimelinessIs information disseminatedrapidly enough to permit timelyaction based on the surveillancesystem?
  15. 15. SURVEILLANCE SYSTEMEVALUATION• Representativeness• Do reported casesdiffer from unreportedcases?
  16. 16. SURVEILLANCE SYSTEMEVALUATION• Positive predictivevalue• What proportion ofthose identifiedactually have thedisease or factor?
  17. 17. SURVEILLANCE SYSTEMEVALUATION• Acceptability• Does the system stimulatethe cooperation ofrespondents?• Does the processdiscourage participation?
  18. 18. SURVEILLANCE SYSTEMEVALUATION• Flexibility• Can changes be easily made inthe system to reflect changesin trends, magnitude andother relevant factors?
  19. 19. SURVEILLANCE SYSTEMEVALUATION• Simplicity• Can the system be simplifiedand still obtain the necessaryinformation?
  20. 20. SURVEILLANCE SYSTEMEVALUATION• Cost/benefit• Is the system worth the cost?• Can costs be reduced withoutsacrificing the essential qualityof the system ?
  21. 21. SURVEILLANCE SYSTEMEVALUATION• Dissemination ofresults• To decision-makers• To data collectors• To the general public
  22. 22. SURVEILLANCE SYSTEMEVALUATION• Appropriateaction taken• Are appropriate actionstaken in response to thesurveillance data?• Does surveillance lead toeffective intervention?
  23. 23. Comparison WithInternational Standards• Use of electronic notification system.• Category of reported cases.• Using of disease specific indicators.• Wide use of active surveillance.• Monitoring of diagnostic efforts.
  24. 24. Comparison With InternationalStandards• Monitoring circulation of organisms.• Awareness about the surveillance.• Giving frequent and relevant feedback.• Dissemination.• Risk Communication.• Evaluation of surveillance system.

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