<prompt> Septic arthritis is caused by:N.gonorrhoeaE.coliMycobacterium tuberculosisAll of the above  <response>: Ans: d All of the above Ref: Bailey, 24,h ed, p. 420All the given organisms can cause septic arthritis in different age groups.Most common cause of septic arthritis - Staph aureus in all age groupsMore common in neonates- E. coli Group B. StreptococciSickle cell anemia patients are susceptible to salmonella arthritis.Aerobic gram negative organisms cause discitis in elderly.Brucella Mycobacterium TB are common in tropics. 