Pooling Nasopharyngeal Swab Specimens to Increase Testing Capacity for SARS-CoV-2

Med J (Ft Sam Houst Tex). 2021 Jan-Mar:(PB 8-21-01/02/03):8-11.

Abstract

The recent emergence of SARS-CoV-2 has led to a global pandemic of unprecedented proportions. Current diagnosis of COVID-19 relies on the detection of SARS-CoV-2 RNA by reverse transcription polymerase chain reaction (RT-PCR) in upper and lower respiratory specimens. While sensitive and specific, these RT-PCR assays require considerable supplies and reagents, which are often limited during global pandemics and surge testing. Here, we show that a nasopharyngeal swab pooling strategy can detect a single positive sample in pools of up to 10 samples without sacrificing RT-PCR sensitivity and specificity. We also report that this pooling strategy can be applied to rapid, moderate complexity assays, such as the BioFire COVID-19 test. Implementing a pooling strategy can significantly increase laboratory testing capacity while simultaneously reducing turnaround times for rapid identification and isolation of positive COVID-19 cases in high risk populations.

MeSH terms

  • COVID-19 / diagnosis*
  • COVID-19 Nucleic Acid Testing*
  • Humans
  • Nasopharynx / virology
  • RNA, Viral / isolation & purification*
  • Reverse Transcriptase Polymerase Chain Reaction*
  • SARS-CoV-2 / isolation & purification*
  • Sensitivity and Specificity
  • Specimen Handling*

Substances

  • RNA, Viral