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Related Experiment Videos

Drying a tuberculosis vaccine without freezing.

Yun-Ling Wong1, Samantha Sampson, Willem Andreas Germishuizen

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 15, 2007
PubMed
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Spray drying offers a stable, effective method for preserving the bacillus Calmette-Guérin (BCG) vaccine without freezing. This novel approach enhances vaccine viability and stability for months at refrigerated and room temperatures.

Area of Science:

  • Vaccinology
  • Microbiology
  • Biotechnology

Background:

  • Rising incidence of tuberculosis (TB) and drug-resistant strains, exacerbated by HIV/AIDS in developing nations.
  • Limitations of the current bacillus Calmette-Guérin (BCG) vaccine in efficacy and stability.
  • Need for improved vaccine formulations with enhanced stability and ease of distribution.

Purpose of the Study:

  • To develop a novel, non-freezing method for preserving BCG vaccine.
  • To assess the stability and viability of spray-dried BCG formulations.
  • To compare the efficacy of spray drying with traditional lyophilization for vaccine preservation.

Main Methods:

  • Spray drying of Mycobacterium bovis BCG and Mycobacterium smegmatis.
  • Optimization of bacterial suspension by removing salts and cryoprotectants (e.g., glycerol).

Related Experiment Videos

  • Incorporation of bacteria into a leucine matrix to form free-flowing powders.
  • Stability testing of dried powders at refrigerated (4°C) and room temperatures (25°C) for extended periods.
  • Comparative viability assessment against lyophilized BCG formulations.

    • Main Results:

    • Spray drying successfully produced stable, vial-fillable powders of BCG and M. smegmatis.
    • Formulations demonstrated remarkable stability for months at 4°C and 25°C with minor activity loss.
    • Optimized drying process significantly reduced bacterial membrane osmotic pressure, improving viability by up to two orders of magnitude.
    • Spray-dried BCG exhibited superior overall viability compared to both in-house and commercial lyophilized preparations.

    Conclusions:

    • Spray drying is a viable alternative to freezing for BCG vaccine preservation, offering enhanced stability.
    • The leucine matrix formulation ensures high yield and free-flowing powder characteristics.
    • This method holds significant potential for improving global access to stable and effective tuberculosis vaccines.