51. Parallel detection of SARS-CoV-2 RNA and nucleocapsid antigen in nasopharyngeal specimens from a COVID-19 patient screening cohort
- Author
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Yuri Lebedin, N E Fedorova, Ekaterina Brzhozovskaya, and Nikolay Mayanskiy
- Subjects
0301 basic medicine ,Microbiology (medical) ,Concentration ,Coronavirus disease 2019 (COVID-19) ,Short Communication ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,viruses ,030106 microbiology ,Patient screening ,Infectious and parasitic diseases ,RC109-216 ,Sensitivity and Specificity ,03 medical and health sciences ,0302 clinical medicine ,Antigen ,Interquartile range ,Nasopharynx ,Concordance ,Medicine ,Humans ,030212 general & internal medicine ,skin and connective tissue diseases ,Nucleocapsid ,business.industry ,SARS-CoV-2 ,fungi ,virus diseases ,RNA ,COVID-19 ,General Medicine ,Virology ,body regions ,Infectious Diseases ,Cohort ,RNA, Viral ,business ,Viral load - Abstract
Objectives: Reverse-transcription PCR (RT-PCR) is considered the most sensitive method for the detection of severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2). However, this method is relatively resource- and time-consuming. This study was performed to compare SARS-CoV-2 nucleocapsid antigen (N-Ag) testing using an enzyme-linked immunosorbent assay (ELISA) with SARS-CoV-2 RNA detection. Methods: Parallel SARS-CoV-2 RT-PCR and quantitative N-Ag ELISA analysis was executed on nasopharyngeal specimens obtained during SARS-CoV-2 screening in a cohort of pre-hospitalization patients. Results: In total, 277 specimens were examined, including 182 (65.7%) RT-PCR-positive specimens, which demonstrated a median cycle threshold (Ct) value of 27 (interquartile range (IQR) 23–35). The SARS-CoV-2 N-Ag was detected in 164 of the 182 RT-PCR-positive specimens (overall sensitivity 90.1%). Among the 95 RT-PCR-negative specimens, 72 were N-Ag-negative (specificity 75.8%). SARS-CoV-2 RT-PCR and N-Ag ELISA results demonstrated a strong agreement (Cramer’s V = 0.668; P
- Published
- 2021