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Related Experiment Videos

Safety assessment post-licensure

E Miller1, P Waight, P Farrington

  • 1PHLS Communicable Disease Surveillance Centre, London, UK.

Developments in Biological Standardization
|December 17, 1998
PubMed
Summary
This summary is machine-generated.

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Post-licensure vaccine surveillance aims to detect rare adverse events and confirm causality. Record linkage of clinical data with immunization history offers a promising method for routine vaccine safety monitoring.

Area of Science:

  • Vaccinology
  • Pharmacoepidemiology
  • Public Health

Background:

  • Post-licensure vaccine surveillance is crucial for identifying rare adverse events and establishing causality.
  • Traditional passive reporting systems have limitations in accurately determining event rates and causal links.
  • Active surveillance systems like IMPACT in Canada improve event ascertainment in sentinel hospitals.

Purpose of the Study:

  • To evaluate methods for post-licensure vaccine safety surveillance.
  • To assess the utility of active surveillance and record linkage for identifying vaccine-related adverse events.
  • To determine the risk of specific adverse events following vaccination.

Main Methods:

  • Utilized an active surveillance system (IMPACT) in Canadian pediatric hospitals.

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  • Employed computerised databases for record linkage between clinical events and immunization records.
  • Defined a set of adverse events for nurses to scrutinize in hospital admissions.

    • Main Results:

    • Active surveillance in IMPACT provides complete ascertainment for hospital-admitted events.
    • Record linkage enabled the definition of risks for events like convulsions associated with DTP, MMR, and Hib vaccines.
    • Causality assessment remains challenging without data outside the vaccination risk period.

    Conclusions:

    • Computerised record linkage of clinical events and immunization data is a valuable tool for routine vaccine safety surveillance.
    • Active surveillance systems enhance the detection of potential vaccine-related adverse events.
    • Further development is needed to overcome limitations in causality assessment within surveillance systems.