Abstract
Depending upon the antigens used and the initial titres, subcutaneous immunization of weaner pigs by means of a temperature-sensitive mutant of live Pasteurella multocida (serovar A), resulted in a significant rise of the level of specific IgG antibody already present in blood serum, but not in lung lavage fluid, and a specific stimulation of lung clearance as compared to non-immunized controls. Aerogenous immunization of a total of 108 animals in 18 experiments did not influence serum antibody titres but produced a significant rise in lung antibodies and P. multocida clearance as compared to an identical number of controls. In all 12 immunization experiments using the live mutant, increased specific IgA antibodies and in seven out of 10 experiments, elevated IgG antibodies were measured. Only aerogenous immunization was found to be capable of reducing the severity of pneumonia induced by intrabronchial infection.
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