What are the risk factors for non-gonococcal arthritis?

Old age (>80 years), RA, immunosuppressed, AIDS, Chronic renal failure, organ transplant, hypogammaglobulinemia, prosthetic join, previous intra-articular corticosteroid injections, DM, OA, low socioeconomic status, alcoholism, IV drug use, cutaneous ulcer, hemoglobinopathy, trauma to joint, SLE.