Immune serum-mediated effects on brucellosis evolution in mice.

Infection and Immunity
M Plommet, A M Plommet

Abstract

Immune serum injected into mice before a footpad challenge of virulent strain Brucella abortus 544 can prevent dissemination of infection to the spleen. Sera from mice infected with Brucella for at least 2 months or from mice vaccinated with a protein-bound cell wall peptidoglycan Brucella fraction completely stopped dissemination. Brucella lipopolysaccharide and polysaccharide cross-reacting Yersinia immune sera reduced dissemination. Both peptidoglycan and lipopolysaccharide immune sera injected simultaneously with an intravenous challenge caused a shift in Brucella from spleen to liver. When immune sera were injected simultaneously with an intravenous challenge, the kinetics of splenic infection showed two effects: an early one, optimally measured at day 7 postchallenge, showed reduced numbers in the spleen due to the shift of Brucella to the liver; a late effect, measured at day 21 postchallenge, showed reduced numbers in spleen and liver with nearly complete clearance by day 49 postchallenge. Brucella lipopolysaccharide and cross-reacting bacterial antisera induced the early effect only, whereas peptidoglycan and infected mouse sera induced both effects. When peptidoglycan immune serum was injected 2 or 7 days after intrav...Continue Reading

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