Abstract
To evaluate the roles of the infectious agent and the host in the pathogensis of Salmonella-associated arthritis (SAA), 1O(3) to 10(6) heat-killed Salmonella enteritidis were injected directly into involved carpal joints in normal and actively immunized rats and in hosts adoptively immunized by the intravenous transfer of spleen cells from syngeneic donors with ongoing SAA. As many as 10(6) living Salmonellae invariably failed to generate more than a transient inflammatory response in normal rats. The regression of acute joint swelling was accelerated in both types of immunized hosts. The intensity and duration of acute inflammation evoked in normal rats by 10(6) and 10(9) heat-killed Salmonellae did not exceed the response elicited by 10(3) living organisms. In sharply contrasting results, however, a chronic arthritis became established in a significant number of actively and adoptively sensitized rats after the intra-articular injection of 10(9) heat-killed organisms. No Salmonellae were recovered from these adoptively sensitized rats although small numbers of organisms has been present among the spleen cells in the transfer inocula. Taken together, these results indicate the obligatory involvement of host factors in the mediation of this chronic arthritis and virtually eliminate any likelihood that joint damage in SAA is due to the directly destructive effects of intra-articular infection.
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Selected References
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