Adjuvant-driven epitope hierarchy correlates with the protective efficacy of FimA vaccine against Klebsiella pneumoniae - Summary - MDSpire

Adjuvant-driven epitope hierarchy correlates with the protective efficacy of FimA vaccine against Klebsiella pneumoniae

  • By

  • Guangyang Ming

  • Longlong Chen

  • Pengju Yan

  • Xiaoqiong Wang

  • Zhifu Chen

  • Qiang Gou

  • Yue Yuan

  • Jiayi Chen

  • Haiming Jing

  • Ping Luo

  • Quanming Zou

  • Jinyong Zhang

  • Zhiyong Liu

  • Renjian Hu

  • Zhuo Zhao

  • June 22, 2026

  • 0 min

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Objective:

To investigate how different adjuvants influence the hierarchy of immunodominant B-cell epitopes of FimA and their impact on vaccine efficacy against hypervirulent Klebsiella pneumoniae.

Approach:
    Key Findings:
    • AddaS03-immunized mice exhibited 100% survival and reduced pulmonary bacterial load.
    • AddaVax-immunized mice showed only 40% survival.
    • Different adjuvants resulted in varying opsonophagocytic killing activities and inflammatory cytokine levels.
    • Three novel immunodominant epitopes were identified, with their hierarchies altered by different adjuvants.
    • Immunization with a mixture of FimA immunodominant epitopes plus AlPO4 achieved an 80% protection rate.
    Interpretation:

    Adjuvants enhance anti-FimA immunity and modulate FimA epitope hierarchies.

    Limitations:
    • The study was conducted in a murine model, which may not fully replicate human immune responses.
    • The long-term efficacy and safety of the vaccine formulations were not assessed.
    Conclusion:

    Rational adjuvant selection may optimize FimA-induced immune responses in Klebsiella pneumoniae vaccines.

Original Source(s)

Adjuvant-driven epitope hierarchy correlates with the protective efficacy of FimA vaccine against Klebsiella pneumoniae

  • by Guangyang Ming, Longlong Chen, Pengju Yan, Xiaoqiong Wang, Zhifu Chen, Qiang Gou, Yue Yuan, Jiayi Chen, Haiming Jing, Ping Luo, Quanming Zou, Jinyong Zhang, Zhiyong Liu, Renjian Hu, Zhuo Zhao

  • June 22, 2026

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