This block comprises arthropathies due to microbiological agents. Distinction is made between the following types of etiological relationship: b) indirect infection, which may be of two types: a reactive arthropathy, where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy, where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking. a) direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;
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