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10.1371/journal.pone.0249972

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33831118!8031412!33831118
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suck abstract from ncbi


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pmid33831118      PLoS+One 2021 ; 16 (4): e0249972
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  • Evaluation of rapid SARS-CoV-2 antigen tests, AFIAS COVID-19 Ag and ichroma COVID-19 Ag, with serial nasopharyngeal specimens from COVID-19 patients #MMPMID33831118
  • Kweon OJ; Lim YK; Kim HR; Choi Y; Kim MC; Choi SH; Chung JW; Lee MK
  • PLoS One 2021[]; 16 (4): e0249972 PMID33831118show ga
  • We evaluated the diagnostic accuracy of two newly developed, point-of-care, rapid antigen tests (RATs) for detecting SARS-CoV-2, the AFIAS COVID-19 Ag and the ichromaTM COVID-19 Ag, and investigated antigen kinetics. A total of 200 serially collected nasopharyngeal (NP) specimens from 38 COVID-19 patients and 122 specimens from negative controls were analyzed. Diagnostic sensitivity and specificity were assessed in comparison to molecular test results and subdivided according to targeted genes (E, RdRP, and N) and days post-symptom onset (PSO). For the kinetics evaluation, cut-off-indices from serial NP specimens were used according to the number of days PSO. Both RATs showed sensitivity of 91.3?100% for specimens with cycle threshold (Ct) < 25. The specificity of AFIAS was 98.7?98.9% and that of ichromaTM was 100.0%. The kappa values of AFIAS and ichromaTM for the molecular testing of specimens with Ct < 25 (RdRP) were 0.97 and 1.00, respectively. The sensitivity of AFIAS and ichromaTM for all genes was lower for specimens collected at 8?14 PSO than for those collected before 7-days PSO. The kinetics profiles showed that antigen levels gradually decreased from 22-days PSO. Both RATs showed excellent specificity and acceptable sensitivity for NP specimens with higher viral loads and for specimens collected within 7-days PSO. Hence, they have the potential to become useful tools for the early detection of SARS-CoV-2. However, because of concerns about false negativity, RATs should be used in conjunction with molecular tests.
  • |*COVID-19 Serological Testing[MESH]
  • |*COVID-19/diagnosis/immunology[MESH]
  • |*Nasopharynx/immunology/virology[MESH]
  • |Adult[MESH]
  • |Aged[MESH]
  • |Aged, 80 and over[MESH]
  • |Antigens, Viral/*immunology[MESH]
  • |Female[MESH]
  • |Humans[MESH]
  • |Male[MESH]
  • |Middle Aged[MESH]
  • |SARS-CoV-2/*immunology[MESH]


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