Clostridioides (Clostridium) difficile infection (CDI) is the most common causative pathogen of health care-associated gastrointestinal infections; however, due to the overlap of clinical symptoms with those of other causes of acute gastroenteritis, the selection of the most appropriate laboratory test is difficult. From April to October 2018, 640 stool samples requested for CDI testing were examined using the mariPOC CDI and Gastro test (ArcDia), which allows the detection of C. difficile glutamate dehydrogenase (GDH) and toxin A/B, norovirus genogroups GI and GII.4, rotavirus, adenovirus, and Campylobacter spp. In parallel, the C. Diff Quik Chek Complete test (Alere) was used as a routine diagnostic assay, and C. difficile toxigenic culture was used as a reference method. The sensitivity of the mariPOC CDI and Gastro test was comparable to that of C. Diff Quik Chek Complete for the detection of GDH (96.40% [95% confidence interval {CI}, 91.81% to 98.82%] versus 95.68% [95% CI, 90.84 to 98.40%]; P = 1.00) and was higher for the detection of toxin A/B (66.67% [95% CI, 57.36 to 75.11%] versus 55.56% [95% CI, 46.08 to 64.74%]; P = 0.00). The specificity of the mariPOC CDI and Gastro test was lower than that of C. Diff Quik Chek Complete for GDH detection (95.21% [95% CI, 92.96% to 96.91%] versus 97.60% [95% CI, 95.85% to 98.76%]; P = 0.04) and comparable to that of C. Diff Quik Chek Complete for toxin A/B detection (99.24 [95% CI, 98.05% to 99.79%] versus 99.81% [95% CI, 98.94% to 100.0%]; P = 0.37). In 29 cases (4.53%), other causative agents of diarrhea were detected (Campylobacter spp. [n = 17], rotavirus [n = 7], and norovirus genogroup GII.4 [n = 5]).

Department of Medical Microbiology 2nd Faculty of Medicine Charles University Motol University Hospital Prague Czech Republic

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