CRP levels (>10 mg/L) were significantly higher in the septic arthritis group than in the non-septic group (26/29 vs. 3/25, P < 0.001), whereas PCT levels (>0.25 ng/ml) showed no significant difference (5/29 vs. 1/25, P = 0.385). The gene discussed is CALCA; the disease is bacterial arthritis.