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To prepare monoclonal antibodies (MAbs) directed against the core-lipid A fractions of smooth lipopoly-saccharide (LPS) from Klebsiella pneumoniae O1:K2, we immunized BALB/c mice with the LPS-associated proteins plus LPS. This preparation exposed the core-lipid A moiety, which is normally hidden in the micellar structure of classical LPS preparations. Among 10 MAbs selected for their reactivity with LPS-associated proteins plus LPS from K. pneumoniae O1:K2, 6 (3A3, 3C2, 3C4, 7D2, 11C3, and 12B6) were directed against the core fraction and 2 (6C5 and 10A5) were directed against the lipid A fraction. Only one (2A4) recognized the O antigen, and one (6D5) had an undefined specificity. When injected before challenge with K. pneumoniae O1:K2 LPS in galactosamine-sensitized mice, five of the MAbs (3C4, 6D5, 7D2, 11C3, and 12B6) provided protection in this model of lethal endotoxemia. MAb 7D2 was also protective in an experimental infection with capsulated K. pneumoniae O1:K2.

Murine monoclonal antibodies to Klebsiella pneumoniae protect against lethal endotoxemia and experimental infection with capsulated K. pneumoniae