Evaluation of filter paper to transport oro/nasopharyngeal samples to detect SARS-CoV-2 by RT-qPCR.
J Virol Methods
; 308: 114587, 2022 10.
Article
in English
| MEDLINE | ID: covidwho-1936900
ABSTRACT
PURPOSE:
To evaluate filter paper as a means to transport oro/nasopharyngeal samples from laboratories with few resources for SARS-CoV-2 detection by RT-qPCR in a central laboratory that usually performs this technique as routine.METHODS:
A total of 40 specimens were evaluated in parallel by RT-qPCR carried out after RNA extraction using two different protocols direct RNA extraction (Protocol A - reference method) and RNA extraction after impregnation in filter paper (Protocol B).RESULTS:
The RT-qPCR for SARS-CoV-2 using Protocol B presented 97.22% (35/36) of agreement for SARS-CoV-2-positive samples when compared to the reference method (Protocol A), even for specimens with low viral load (increased Ct values). Noteworthy, three clinical specimens which were categorized as inconclusive by Protocol A presented amplification of both N1 and N2 targets using Protocol B, presenting positive results for SARS-CoV-2.CONCLUSION:
The use of filter paper to transport oro/nasopharyngeal clinical samples presented very satisfactory results to detect SARS-CoV-2 by RT-qPCR. In addition, it proved to be a feasible and sensitive approach, being able to generate the detection of SARS-CoV-2 even at low concentrations, without presenting false-negative results.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
SARS-CoV-2
/
COVID-19
Type of study:
Diagnostic study
/
Experimental Studies
/
Prognostic study
Limits:
Humans
Language:
English
Journal:
J Virol Methods
Year:
2022
Document Type:
Article
Affiliation country:
J.jviromet.2022.114587
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