A lower percentage of NAAT+/toxin− cases than NAAT+/toxin+ cases had WBC count ≥15,000/μL (23.9% vs 40.8%; P < .0001), serum albumin ≤2.5 g/dL (25.2% vs 31.1%; P = .02), pseudomembranous colitis (14.3% vs 40.0%; P = .009), and CDI recurrence (7.8% vs 16.6%; P < .0001) (Table 1). This evidence concerns the gene ALB and clostridium difficile infection.