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Vaccine strategies tested against Klebsiella pneumoniae: live attenuated vaccines based on genetically modified bacteria; inactivated whole cell vaccines; outer membrane vesicles containing numerous virulence factors; polysaccharide and lipopolysaccharide (LPS)-based vaccines; protein-based vaccine (recombinant or purified from bacterial extracts); conjugate vaccines including PS–protein or LPS–protein fusions; ribosomal vaccines
