What is the most common cause of septic arthritis among IV drug users?

Updated: Sep 03, 2019
  • Author: John L Brusch, MD, FACP; Chief Editor: Michael Stuart Bronze, MD  more...
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Staphylococcus aureus remains the most common infectious agent in people who abuse intravenous drugs. However, a high rate of infections with gram-negative organisms, especially Pseudomonas aeruginosa and Serratia species, occurs in cases of septic arthritis. In addition, a higher rate of fungal and anaerobic infections occurs. Unusual locations, such as the sternoclavicular joint, are involved.

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