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USE OF ACUTE HEPATITIS SURVEILLANCE TO EVALUATE PROGRAM FOR VIRAL HEPATITIS PREVENTION AND CONTROL

USE OF ACUTE HEPATITIS SURVEILLANCE TO EVALUATE PROGRAM FOR VIRAL HEPATITIS PREVENTION AND CONTROL. Central Asian Program, DIH, EPO, CDC. Acute Hepatitis Incidence, Kyrgyzstan , 1990-2002. Weaknesses of the Acute Hepatitis Surveillance Used before 2000.

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USE OF ACUTE HEPATITIS SURVEILLANCE TO EVALUATE PROGRAM FOR VIRAL HEPATITIS PREVENTION AND CONTROL

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  1. USE OF ACUTE HEPATITIS SURVEILLANCE TO EVALUATE PROGRAM FOR VIRAL HEPATITIS PREVENTION AND CONTROL Central Asian Program, DIH, EPO, CDC

  2. Acute Hepatitis Incidence,Kyrgyzstan, 1990-2002

  3. Weaknesses of the Acute Hepatitis Surveillance Used before 2000 • Acute hepatitis case definition was not applied • Cases were not serologically tested for specific markers of acute hepatitis A,B,C and D • Epidemiological data collection procedure and analysis methodology were not standardized

  4. Sentinel Surveillance Introduction (goals) • To provide reliable etiological diagnostics of acute viral hepatitis on bases of representative sample • To define risk groups and risk factors for acute hepatitis • To use surveillance data for design, monitoring and evaluation of programs for viral hepatitis control and prevention • To provide database for epidemiological studies

  5. Sentinel Surveillance Introduction (stages 1) • National Reference Laboratory was established; standard laboratory procedures and quality assurance were provided • External Quality Assessment of the accuracy of Reference laboratory results was conducted in CDC, Atlanta • Corresponding Ministry of Health orders were issued • Sentinel Sites were organized in three regions: Bishkek, Naryn and Jalal-Abad

  6. Sentinel Surveillance Introduction (stages2) • The structure and procedure of sentinel surveillance were developed, including: • sample size and sampling design • acute hepatitis case definition • algorismof laboratory testing • acute hepatitis case classification • standard questionnaire for epidemiological data collection • blood samples collection and transportation • 4 trainings have been conducted for the sentinel sites personnel (laboratory workers, physicians, epidemiologists, nurses) on sentinel surveillance structure and operating, data quality assurance

  7. Acute Hepatitis Case • Infectious Hospital • (physician, nurse) • - confirmation of correspondence to case definition • - filling in and marking of the questionnaire • - blood sample collection and marking • - transportation of samples and questionnaires to the State • Sanitation and Epidemiological Surveillance Center State Sanitary and Epidemiological Surveillance Center (epidemiologist, laboratory worker) - serum separation - transportation of samples and questionnaires to the Reference Laboratory

  8. Reference Laboratory (epidemiologist, laboratory worker) - laboratory testing - data entering - data analysis and report preparation report report report Ministry of Health State Department of Sanitation and Epidemiological Surveillance Regional health authorities and State Sanitation and Epidemiological Surveillance Centers

  9. Algorithm of Laboratory Testing Blood sample HBsAg IgM anti-HBc IgM anti-HAV Total anti-HCV + Anti-HDV

  10. GNP/capita(USD) 1994-2000 European Bank for Reconstruction and Development. Transition Report Update, May 2002.

  11. Aims: • To evaluate parenteral hepatitis risk factors • To assess an impact of universal newborn Hepatitis B immunization program

  12. Materials and Methods(1) • Study design: matched case control study (1 case + 2 controls matched by age, sex and place of residence) • Cases: acute hepatitis B, C and D cases (parenteral hepatitis), 2000-2003 • Controls:acute hepatitis A cases, 2000-2003 • N = 214 case-control sets • EPI INFO matched case-control analysis followed by conditional logistic regression

  13. Risk Factors (6 months prior to the onset of disease) • Blood transfusion • Surgery • Injections in hospital • Injections in polyclinic • Blood samples collection in polyclinic • Visit to surgeon, dentist, urologist, gynecologist • Blood donation • Multiple sexual partners • STD

  14. Risk Factors of Parenteral Hepatitis (monovariate analysis)

  15. Risk Factors of Parenteral Hepatitis(2)

  16. Conclusion • Risk of parenterally transmitted viral hepatitis remains significant in health facilities. The system of blood and injection safety should be improved • The system of health communication and training to improve understanding of natural Hep B transmission mechanisms and prevention measures should be strengthened (+HIV)

  17. Hepatitis B Immunization Program in Kyrgyzstan • Introduced in April 1999 • High immunization coverage – > 95% • 23 cases of acute HB among fully immunized children registered by routine surveillance

  18. Materials and Methods (2) • Comparison of acute hepatitis B incidence rates among vaccinated and unvaccinated children born in sentinel sites between 2000 and 2003 • Analyses of acute hepatitis B incidence among children under 5 years of age in sentinel sites for the period 2000 to 2003 • Hepatitis B cases: acute hepatitis sentinel surveillance database • Vaccination status of acute hepatitis B cases:primary health facility immunization records • Number of children in age groups andvaccination status of non-infected children: official statistical data of the Ministry of Health

  19. Acute Hepatitis B Cases Among Children Under 4,Sentinel Surveillance, 2000-2003

  20. Incidence rates among vaccinated and unvaccinated children, Bishkek, Naryn, Jalalabat , 2000-2003

  21. Acute Hepatitis Incidence Among children under 5, 2000-2003 50 100 47,4 45 90 86 40 80 35 70 66 30 60 % 25 50 46 20 40 18,8 Morbidity ratio %000 15 30 26 10 20 7 5,1 5 10 0 0 2000 2001 2002 2003 VHB morbidity rate VHB immunization coverage

  22. Conclusions (1) • AHSS allows effective MONITORING of immunization program in sentinel sites, providing the ability to: • carry out epidemiological investigation of every case of acute viral Hepatitis B • identify and quickly respond to immunization program errors

  23. Conclusions (2) KAHSS provides: • the ability to EVALUATE the impact of an immunization program • an advocacy tool to support the necessity of sustainable immunization programs

  24. Study Limitations • Evaluation of risk factors: • Use of acute hepatitis A cases as controls; • Aggregation of acute hepatitis B, C and D cases into one group of parenteral hepatitis • Evaluation of Immunization program: • Use of official statistical data to define the size of target age groups and vaccinated and unvaccinated children

  25. Acknowledgements • The Ministry of Health of the Kyrgyz Republic • Republican Center for Viral Hepatitis Prevention • State Department of Sanitation and Epidemiological Surveillance • Republican Center for Immunization

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