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Quantitative in vitro total toxin production in study of C. difficile at 2 US Veteran Affairs long-term care facilities and their affiliated acute care facilities. Results at 24, 48, and 72 hours of incubation are shown for REA strains AF (ribotype 244), BI (ribotype 027), DQ (ribotype 591), J (ribotype 001), and T (a nontoxigenic Clostridioides difficile strain). REA, restriction endonuclease analysis.
