Evaluation of a rapid dengue test at the local level
DOI:
https://doi.org/10.51481/amc.v50i4.8Keywords:
dengue, rapid test, lab diagnostic, concordance of results, epidemiological surveillance, kappa indexAbstract
Background and aim: To analyze concordance of results obtained using the Dengue Duo IgM &IgG® rapid test (Pan Bio®) applied at the local level in different areas across the country and the MAC ELISA used at National Reference Center for Virology (CNRV)
Methodology: The results of 828 dengue tests carried out with the Duo IgM& IgG® (Pan Bio®) at local level and at the CNRV were compared by the kappa index with those obtained with a MAC ELISA test at the CNRV. An inspection visit to participating laboratories was made and unknown samples were sent to evaluate the performance of the participants and to check the fulfillment of the procedures used with the recommendations of the manufacturer.
Results: The kappa index of the results of the rapid test used at local level in comparison with the MAC ELISA was 0.62 (CI 95% 90-95); the concordance of the positive samples was 75% (CI 95% 71-79). The kappa index of the rapid test used at the CNRV was 0.81 (CI 95% 0.881.74) and the concordance of the positive samples was 93% (CI 95% 90-95). All laboratories showed ideal facilities to carry out the tests and the staff got the training required; however, the attention to other analyses affected the reading within the time recommended. The concordance of the unknown samples was 100%.
Conclusion: A significant difference was demonstrated in the kappa index and the concordance of positive samples between the rapid tests carried out at the participant laboratories and at the CNRV. These results imply that decentralization of this methodology would require continuous support to identify correctable factors of disagreement and to promote the generation of consistent results to orient the decision-making process.
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