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Selective risk group strategies in North America
1Division of STD Control, Health and Welfare Canada, Tunney's Pasture, Ottawa.
Vaccine
|January 1, 1995
Summary
Hepatitis B immunization policies in Canada and the USA shifted towards universal vaccination by 1991. Selective strategies primarily benefited healthcare workers, with limited impact on disease epidemiology, necessitating continued targeted programs alongside universal efforts.
Area of Science:
- Public Health
- Immunization Policy
- Infectious Disease Epidemiology
Background:
- Hepatitis B immunization policies in Canada and the USA underwent significant evolution starting in 1982.
- Early policies (1982-1985) focused on selective immunization for high-risk groups, including healthcare workers, transfusion recipients, infants of HBsAg-positive mothers, and individuals at risk of sexual transmission.
- Prenatal screening policies were established in both countries by 1988.
Purpose of the Study:
- To analyze the evolution of hepatitis B immunization policies in Canada and the USA.
- To evaluate the impact of selective versus universal vaccination strategies on disease epidemiology.
- To provide recommendations for ongoing hepatitis B prevention efforts.
Main Methods:
- Review of national immunization policies and recommendations in Canada and the USA from 1982 to 1991.
- Analysis of vaccine distribution patterns, noting the predominant delivery to healthcare workers.
- Assessment of the epidemiological impact of selective immunization strategies on hepatitis B transmission.
Main Results:
- Policies culminated in universal hepatitis B vaccination recommendations by 1991 in both countries.
- Selective immunization programs primarily reached healthcare workers, with limited demonstrable changes in overall disease epidemiology.
- The effectiveness of selective strategies in altering disease patterns was not evident.
Conclusions:
- While universal hepatitis B vaccination is recommended, selective immunization programs remain crucial.
- Continued targeted vaccination is necessary to protect individuals currently at high risk.
- A dual approach combining universal and selective strategies is essential for comprehensive hepatitis B prevention.
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