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Generalized-Modules-for-Membrane-Antigens (GMMA) is a technology platform developed to design outer membrane vesicle (OMV)-based vaccines. GMMA are basically OMVs derived from a bacterial strain specifically engineered to obtain a fit-for-purpose and affordable vaccine by potentiating, or deleting, expression of specific genes. OMVs can be used as a carrier for antigens by inducing their expression on them, with the aim to improve antigen immunogenicity and design multivalent combination vaccines. We expanded this finding to show that the chemical conjugation of different proteic and/or polysaccharidic antigens, to GMMA, is a methodology complementary to the genetic manipulation to obtain highly effective combination vaccines. Here we discuss our findings with a specific focus on the impact that GMMA technology can have on global health, as this technology platform is particularly suited to support the development of affordable vaccines for low-income countries. We believe that it is critical to elucidate the mode of action of GMMA immunogenicity and have provided a summarized description of the immunological questions to be addressed in the near future. The improved knowledge of GMMA might lead to designing more effective and safer GMMA-based vaccines to tackle the most serious vaccine-preventable diseases.

GMMA as a ‘plug and play’ technology to tackle infectious disease to improve global health: context and perspectives for the future