Abstract

A micro-titration plate bactericidal assay was developed to measure complement-dependent antibody-mediated killing of Pasteurella haemolytica. Sera and lung washings from specific pathogen-free (SPF) lambs convalescent from a challenge with live, virulent P. haemolytica were bactericidal in the presence of complement. Similar samples from naive SPF lambs had no such activity. Purified IgG derived from a convalescent lamb serum was as bactericidal as the whole serum. Absorption of convalescent serum with lipopolysaccharide from P. haemolytica abolished bactericidal activity, suggesting that this antigen may be a target for antibody in the bactericidal complex.

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