Figure 2.
Decision tree of CDI diagnostic strategies. (A) Decision tree of one-step NAAT alone pathway; (B) Decision tree of two-step algorithm with GDH/toxin followed by NAAT. Patients with positive tests, or false negative tests would be treated. Following treatment, patients could be cured from CDI, unresponsive to treatment, or dead. Patients who failed response to the initial treatment received the next line treatment. Patients who were cured from CDI may develop another CDI, where recurrence of CDI was assumed to occur at least 4 weeks after the previous infection. Up to two recurrences were modelled in all patients, including patients who had treatment failure. CDI: Clostridioides difficile infection; GDH: Glutamate Dehydrogenase; IV MNZ + VCM: Intravenous Metronidazole and Vancomycin; NAAT: Nucleic Acid Amplification Test.