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  • Title: Experimental Streptococcus sanguis endocarditis: immune complexes and renal involvement.
    Author: Thörig L, Daha MR, Eulderink F, Kooy-Bauer WC, Thompson J.
    Journal: Clin Exp Immunol; 1980 Jun; 40(3):469-77. PubMed ID: 7418263.
    Abstract:
    An increase of agglutinins and circulating immune complexes (CIC) was observed in the sera of rabbits after the induction of bacterial endocarditis (BE) by intravenous injection of live streptococci into animals with a non-bacterial thrombotic endocarditis. Rabbits immunized for 12 days with heat-killed streptococci developed higher levels of agglutinins and CIC than did those unimmunized during BE. The levels remained elevated in the immunized rabbits after the induction of streptococcal endocarditis. In rabbits with very high levels of CIC complement activation occurred in vivo, possibly via the classical pathway. Kidneys from both unimmunized and immunized rabbits with streptococcal endocarditis contained bacteria and also showed inflammatory reactions but only the renal tissue of immunized rabbits with endocarditis showed a little mesangial deposition of immunoglobulin. The findings in this study indicate that in rabbits, renal inflammation due to BE is initiated more often by septic emboli than by immune complex deposition, at least during the first 12 days after infection.
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