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Related Experiment Videos

Vaccines for preventing smallpox.

W Metzger1, B G Mordmueller

  • 1Max-Planck-Institute for Infection Biology, Molecular Biology, Schumannstrasse 21/22, Berlin, Germany, 10117. wgmetzger@yahoo.com

The Cochrane Database of Systematic Reviews
|July 20, 2007
PubMed
Summary
This summary is machine-generated.

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Smallpox vaccines, both older and newer cell-cultured types, demonstrate similar effectiveness and immunogenicity. Diluted vaccines remain effective, but adverse events highlight the need for improved smallpox vaccine development.

Area of Science:

  • Virology
  • Immunology
  • Vaccinology

Background:

  • Smallpox eradication in 1980 has not diminished concerns about its bioweapon potential.
  • This has spurred renewed interest in developing effective smallpox vaccines.
  • Existing stockpiled and novel cell-cultured vaccines are under scrutiny for emergency preparedness.

Purpose of the Study:

  • To evaluate the efficacy of smallpox vaccines in preventing disease.
  • To assess the immunogenicity induced by smallpox vaccines.
  • To determine the frequency and nature of adverse events associated with smallpox vaccination.

Main Methods:

  • Systematic review of randomized controlled trials (RCTs) of smallpox vaccines.
  • Searched multiple databases including Cochrane, MEDLINE, and EMBASE up to December 2006.

Related Experiment Videos

  • Included 10 RCTs with 2412 participants comparing various vaccine types, dilutions, and controls.

    • Main Results:

    • Both first-generation (calf-lymph derived) and second-generation (cell-cultured) vaccines showed high immunogenicity and clinical success rates.
    • Vaccine dilutions of 1:10 were as effective as undiluted versions, provided initial concentration was defined.
    • Serious adverse events occurred in 1-2% of participants; fever and headache were common, with fever less frequent for newer vaccines.

    Conclusions:

    • Stockpiled and new cell-cultured smallpox vaccines exhibit comparable immunogenicity and success rates.
    • Diluted vaccines (≥1:10) maintain efficacy without reducing adverse event rates.
    • While efficacy is similar in naive and previously vaccinated individuals, the latter experienced fewer adverse events, underscoring the need for vaccine improvement.