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Related Experiment Video

Updated: Jun 4, 2026

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Bacillus Calmette-Guérin vaccination using a microneedle patch.

Yasuhiro Hiraishi1, Subhadra Nandakumar, Seong-O Choi

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, N.W., Atlanta, GA 30332, USA.

Vaccine
|February 1, 2011
PubMed
Summary

A novel microneedle patch delivers the bacillus Calmette-Guérin (BCG) vaccine for tuberculosis, offering a safer, needle-free alternative. This innovative patch elicits a strong immune response comparable to traditional methods, potentially improving global vaccination coverage.

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Area of Science:

  • Immunology
  • Vaccinology
  • Biotechnology

Background:

  • Tuberculosis (TB) remains a leading cause of bacterial mortality worldwide.
  • The bacillus Calmette-Guérin (BCG) is the sole licensed human vaccine against TB.
  • Current BCG vaccination methods face logistical challenges and risks associated with hypodermic needles.

Purpose of the Study:

  • To engineer and evaluate a BCG-coated microneedle vaccine patch for improved intradermal delivery.
  • To assess the immunogenicity and safety of the microneedle patch compared to traditional BCG vaccination.
  • To explore a simpler, safer, and more compliant vaccination strategy for TB prevention.

Main Methods:

  • Design and fabrication of a BCG-coated microneedle array patch.
  • Intradermal vaccination of guinea pigs with the microneedle patch or traditional BCG injection.
  • Assessment of cell-mediated immune responses, including lymphocyte proliferation and cytokine (IFN-γ) levels.
  • Quantification of specific T cell populations (CD4(+)IFN-γ(+), CD4(+)TNF-α(+), CD4(+)IFN-γ(+)TNF-α(+)).

Main Results:

  • The BCG-coated microneedle patch induced a robust cell-mediated immune response in guinea pigs.
  • Immune responses, including antigen-specific lymphocyte proliferation and IFN-γ levels, were comparable to conventional intradermal BCG vaccination.
  • High frequencies of specific T cell subsets (CD4(+)IFN-γ(+), CD4(+)TNF-α(+), CD4(+)IFN-γ(+)TNF-α(+)) were observed.
  • The microneedle patch demonstrated high immunogenicity in the animal model.

Conclusions:

  • BCG-coated microneedle vaccine patches represent a promising technology for TB prevention.
  • This needle-free approach offers a simpler, safer, and potentially more compliant vaccination method.
  • The technology could enhance BCG vaccine coverage, particularly in resource-limited settings with inadequate healthcare infrastructure.