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- Title
Diagnostic accuracy and acceptability of molecular diagnosis of COVID-19 on saliva samples relative to nasopharyngeal swabs in tropical hospital and extra-hospital contexts: The COVISAL study.
- Authors
Nacher, Mathieu; Mergeay-Fabre, Mayka; Blanchet, Denis; Benois, Orelie; Pozl, Tristan; Mesphoule, Pauline; Sainte-Rose, Vincent; Vialette, Véronique; Toulet, Bruno; Moua, Aurélie; Saout, Mona; Simon, Stéphane; Guidarelli, Manon; Galindo, Muriel; Biche, Barbara; Faurous, William; Chaizemartin, Laurie; Fahrasmane, Aniza; Rochemont, Devi; Diop, Fode
- Abstract
A prospective study was conducted among different intra and extra-hospital populations of French Guiana to evaluate the performance of saliva testing compared to nasopharyngeal swabs. Persons aged 3 years and older with mild symptoms suggestive of COVID-19 and asymptomatic persons with a testing indication were prospectively enrolled. Nasopharyngeal and salivary samples were stored at 4°C before analysis. Both samples were analyzed with the same Real-time PCR amplification of E gene, N gene, and RdRp gene. Between July 22th and October 28th, 1159 persons were included, of which 1028 were analyzed. When only considering as positives those with 2 target genes with Ct values <35, the sensitivity of RT-PCR on saliva samples was 100% relative to nasopharyngeal samples. Specificity positive and negative predictive values were above 90%. Across a variety of cultures and socioeconomic conditions, saliva tests were generally much preferred to nasopharyngeal tests and persons seemed largely confident that they could self-sample. For positive patients defined as those with the amplification of 2 specific target genes with Ct values below 35, the sensitivity and specificity of RT-PCR on saliva samples was similar to nasopharyngeal samples despite the broad range of challenging circumstances in a tropical environment.
- Subjects
FRENCH Guiana; MOLECULAR diagnosis; COVID-19 testing; SALIVA analysis; SENSITIVITY &; specificity (Statistics); GENE amplification; SALIVA
- Publication
PLoS ONE, 2021, Vol 16, Issue 9, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0257169