Comparative Evaluation of Three Immunoassays for the Simultaneous Detection of Clostridioides difficile Glutamate Dehydrogenase and Toxin A/B
Abstract
:1. Introduction
2. Materials and Methods
2.1. Samples
2.2. Three Immunoassays for the Detection of GDH Antigen and CD Toxin A/B
2.3. C. difficile Culture and Nucleic Acid Amplification Test for C. difficile Toxin A/B
2.4. Statistical Analysis
3. Results
3.1. Analytical Performance of the Three GDH Immunoassays as Compared to C. difficile Culture
3.2. Analytical Performance of the Three Toxin A/B Immunoassays as Compared to the Xpert C. difficile Assay
3.3. Analytical Performance of the Three GDH Immunoassays as Compared to the Consensus GDH Results
3.4. Analytical Performance of the Three Toxin A/B Immunoassays as Compared to the Consensus Toxin A/B Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Characteristic | VIDAS C. difficile GDH and Toxin A&B | RIDASCREEN C. difficile GDH and Toxin A/B | C. DIFF QUIK CHEK COMPLETE |
---|---|---|---|
Manufacturer | bioMérieux | R-Biopharm | TechLab |
Immunoassay system | VIDAS | GEMINI | Not required |
Principle of operation | Enzyme-linked fluorescent assay | Enzyme-linked immunosorbent assay | Lateral flow membrane enzyme assay |
Testing concurrency * | Separately | Separately | Simultaneously |
Sample type | Stool | Stool | Stool |
Minimum sample volume | 200 μL | 100 μL | 25 μL |
Running time of process | 90 min | 120 min | 30 min |
Immunoassay | Result | C. difficile Culture | Kappa (95% CI) | Sensitivity, % (95% CI) | Specificity, % (95% CI) | p-Value | |
---|---|---|---|---|---|---|---|
Positive (n = 124) | Negative (n = 180) | %Diff (95% CI) | |||||
VIDAS GDH | Positive | 120 | 49 | 0.66 (0.58–0.74) | 96.8 (92.0–99.1) | 72.8 (65.7–79.1) | <0.0001 |
Negative | 4 | 131 | −14.52 (−18.89 to −10.15) | ||||
RIDA GDH | Positive | 111 | 42 | 0.64 (0.55–0.72) | 89.5 (82.7–94.3) | 76.7 (69.8–82.6) | 0.0001 |
Negative | 13 | 138 | −9.54 (−14.2 to −4.88) | ||||
QCC GDH | Positive | 118 | 47 | 0.66 (0.58–0.74) | 95.2 (89.8–98.2) | 73.9 (66.8–80.1) | <0.0001 |
Negative | 6 | 133 | −13.49 (−17.93 to −9.04) |
Immunoassay | Result | Xpert C. difficile Assay | Kappa (95% CI) | Sensitivity, % (95% CI) | Specificity, % (95% CI) | p-Value | |
---|---|---|---|---|---|---|---|
GDH | %Diff (95% CI) | ||||||
Positive (n = 152) | Negative (n = 152) | ||||||
VIDAS GDH | Positive | 143 | 26 | 0.77 (0.70–0.84) | 94.1 (89.1–97.3) | 82.9 (76.0–88.5) | 0.0060 |
Negative | 9 | 126 | −5.59 (−9.35 to −1.83) | ||||
RIDA GDH | Positive | 139 | 14 | 0.82 (0.76–0.87) | 91.5 (85.8–95.4) | 90.8 (85.0–94.9) | 1.0000 |
Negative | 13 | 138 | −0.33 (−3.68 to 3.02) | ||||
QCC GDH | Positive | 141 | 24 | 0.77 (0.70–0.84) | 92.8 (87.4–96.3) | 84.2 (77.4–89.6) | 0.0410 |
Negative | 11 | 128 | −4.28 (−8.06 to −0.49) | ||||
CD toxin A/B | |||||||
Positive (n = 152) | Negative (n = 152) | ||||||
VIDAS CDAB | Positive | 86 | 10 | 0.5 (0.41–0.59) | 56.6 (48.3–64.6) | 93.4 (88.2–96.8) | <0.0001 |
Negative | 66 | 142 | 18.42 (13.2 to 23.65) | ||||
RIDA toxin A/B | Positive | 76 | 0 | 0.5 (0.42–0.58) | 50.0 (41.8–58.2) | 100 (97.6–100) | <0.0001 |
Negative | 76 | 152 | 25 (20.13 to 29.87) | ||||
QCC toxin A/B | Positive | 78 | 4 | 0.49 (0.40–0.57) | 51.3 (43.1–59.5) | 97.4 (93.4–99.3) | <0.0001 |
Negative | 74 | 148 | 23.03 (17.95 to 28.1) |
Immunoassay | Result | Consensus Result | Kappa (95% CI) | PPA, % (95% CI) | NPA, % (95% CI) | p-Value | |
---|---|---|---|---|---|---|---|
GDH | %Diff (95% CI) | ||||||
Positive (n = 161) | Negative (n = 143) | ||||||
VIDAS GDH | Positive | 160 | 9 | 0.94 (0.89–0.97) | 99.4 (96.6–100) | 93.7 (88.4–97.1) | 0.0215 |
Negative | 1 | 134 | −2.63 (−4.65 to −0.61) | ||||
RIDA GDH | Positive | 142 | 11 | 0.80 (0.94–0.87) | 88.2 (82.2–92.7) | 92.3 (86.7–96.1) | 0.2005 |
Negative | 19 | 132 | 2.63 (0.89 to 6.12) | ||||
QCC GDH | Positive | 159 | 6 | 0.95 (0.91–0.98) | 98.7 (95.6–100) | 95.8 (91.1–98.4) | 0.2891 |
Negative | 2 | 137 | −1.32 (−3.13 to 0.5) | ||||
CD toxin A/B | |||||||
Positive (n = 86) | Negative (n = 218) | ||||||
VIDAS CDAB | Positive | 83 | 13 | 0.88 (0.82–0.94) | 96.5 (90.1–99.3) | 94.0 (90.0–96.8) | 0.0213 |
Negative | 3 | 205 | −3.29 (−5.84 to −0.74) | ||||
RIDA toxin A/B | Positive | 72 | 4 | 0.85 (0.78–0.92) | 83.7 (74.2–90.8) | 98.2 (95.4–99.5) | 0.0309 |
Negative | 14 | 214 | 3.29 (0.58 to 6) | ||||
QCC toxin A/B | Positive | 79 | 3 | 0.92 (0.87–0.97) | 91.9 (84.0–96.7) | 98.6 (96.0–99.7) | 0.3438 |
Negative | 7 | 215 | 1.32 (−0.72 to 3.35) |
Case (N = 39) | CD Culture | GDH | Xpert Assay | CD Toxin A/B | ||||
---|---|---|---|---|---|---|---|---|
VIDAS | RIDA | QCC | VIDAS | RIDA | QCC | |||
A (N = 5) | Neg | Pos | Pos | Pos | Pos | Pos | Pos | Pos |
B (N = 1) | Neg | Pos | Pos | Pos | Pos | Pos | Pos | Neg |
C (N = 2) | Neg | Pos | Pos | Pos | Pos | Pos | Neg | Pos |
D (N = 1) | Neg | Pos | Pos | Pos | Pos | Neg | Pos | Pos |
E (N = 1) | Neg | Pos | Pos | Pos | Pos | Neg | Pos | Neg |
F (N = 17) | Neg | Pos | Pos | Pos | Pos | Neg | Neg | Neg |
G (N = 3) | Neg | Pos | Neg | Pos | Pos | Neg | Neg | Neg |
H (N = 5) | Neg | Neg | Pos | Neg | Pos | Neg | Neg | Neg |
I (N = 1) | Neg | Neg | Neg | Neg | Pos | Neg | Neg | Neg |
J (N = 3) | Neg | Pos | Pos | Pos | Neg | Neg | Neg | Neg |
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Kim, N.; Lee, S.Y.; Park, J.; Lee, J. Comparative Evaluation of Three Immunoassays for the Simultaneous Detection of Clostridioides difficile Glutamate Dehydrogenase and Toxin A/B. Microorganisms 2022, 10, 947. https://doi.org/10.3390/microorganisms10050947
Kim N, Lee SY, Park J, Lee J. Comparative Evaluation of Three Immunoassays for the Simultaneous Detection of Clostridioides difficile Glutamate Dehydrogenase and Toxin A/B. Microorganisms. 2022; 10(5):947. https://doi.org/10.3390/microorganisms10050947
Chicago/Turabian StyleKim, Namsu, Seung Yeob Lee, Joonhong Park, and Jaehyeon Lee. 2022. "Comparative Evaluation of Three Immunoassays for the Simultaneous Detection of Clostridioides difficile Glutamate Dehydrogenase and Toxin A/B" Microorganisms 10, no. 5: 947. https://doi.org/10.3390/microorganisms10050947
APA StyleKim, N., Lee, S. Y., Park, J., & Lee, J. (2022). Comparative Evaluation of Three Immunoassays for the Simultaneous Detection of Clostridioides difficile Glutamate Dehydrogenase and Toxin A/B. Microorganisms, 10(5), 947. https://doi.org/10.3390/microorganisms10050947