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Klebsiella pneumoniae is an important nosocomial pathogen causing severe pulmonary infections. The majority of clinical Klebsiella isolates produce a high-molecular-weight capsular polysaccharide (CPS) which is one of the dominant virulence factors. In the present study, we examined the potency of a murine immunoglobulin M monoclonal antibody (MAb) with specificity to Klebsiella type 2 CPS to protect rats against experimental Klebsiella pneumonia. The MAb did not prevent the invasion of virulent bacteria into the interalveolar space. However, the resolution of infection was accelerated in MAb-treated animals. This was demonstrated by (i) less severe weight loss and (ii) markedly reduced inflammatory reactions in the lung. The elimination of bacteria was significantly increased not only in the lungs but also in the livers of antibody-treated rats. This was reflected by reduced levels of circulating, soluble CPS and MAb-bound CPS. A mixture of human MAbs with specificity to CPS of clinically important Klebsiella serotypes may prove to be a useful tool for the prevention or supportive treatment of Klebsiella pneumonia.

Monoclonal antibody against Klebsiella capsular polysaccharide reduces severity and hematogenic spread of experimental Klebsiella pneumoniae pneumonia