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Consultation report - gonococcal immunoassays and standards for vaccine development
C A MacLennan1, P Davis2, S L Gottlieb3
1Jenner Institute, Nuffield Department of Medicine, University of Oxford, Oxford, UK; Department of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK.
Vaccine
|May 23, 2026
Summary
Developing a gonococcal vaccine is crucial due to rising antimicrobial resistance. Standardized immunoassays and international standards are urgently needed to compare vaccine candidates and ensure effective gonorrhoea prevention.
Area of Science:
- Vaccinology
- Microbiology
- Public Health
Background:
- Gonorrhoea, a sexually transmitted infection caused by *Neisseria gonorrhoeae*, poses significant risks to sexual, reproductive, and neonatal health.
- Increasing antimicrobial resistance in *N. gonorrhoeae* necessitates urgent global health interventions, including vaccine development.
- An effective gonococcal vaccine would significantly benefit global public health and combat the silent pandemic of antimicrobial resistance.
Purpose of the Study:
- To address the critical need for standardized immunoassays for comparing gonococcal vaccine candidates.
- To discuss priorities for gonococcal immunoassay standardization, including the development of an international reference serum.
- To facilitate the comparison of vaccine-induced immune responses across different clinical trials.
Main Methods:
- A workshop was convened in April 2024, bringing together vaccine developers, regulators, and assay standardization specialists.
- Discussions focused on identifying key challenges and priorities in gonococcal immunoassay standardization.
- Exploration of the need for international standards, including a reference serum and standard target strains.
Main Results:
- Identified a significant lack of harmonized immunoassays as a major hurdle in comparing gonococcal vaccine candidates.
- Highlighted the absence of international standards, such as a reference serum and standard target strains, for gonococcal immunoassays.
- Emphasized the need for standardized assays to accurately assess immune responses and potential correlates of protection.
Conclusions:
- Standardization of gonococcal immunoassays is paramount for the successful development and comparison of candidate vaccines.
- The establishment of international standards and a reference serum is a critical next step.
- Further research, including data from clinical studies like those involving 4CMenB, is needed to discern correlates of protection, requiring standardized assays.
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