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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

63.8K
Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
63.8K

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Updated: Dec 10, 2025

Two-Step Reverse Transcription Droplet Digital PCR Protocols for SARS-CoV-2 Detection and Quantification
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Optimizing RT-PCR detection of SARS-CoV-2 for developing countries using pool testing.

Mauricio J Farfan1, Juan P Torres2, Miguel O'Ryan3

  • 1Hospital Dr. Luis Calvo Mackenna, Santiago, Chile.

Revista Chilena De Infectologia : Organo Oficial De La Sociedad Chilena De Infectologia
|August 28, 2020
PubMed
Summary
This summary is machine-generated.

Pooling 5 SARS-CoV-2 samples for nucleic acid testing is a reliable and cost-effective strategy. This method reduces reagent costs and the risk of false negatives, aiding COVID-19 diagnosis in developing nations.

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Area of Science:

  • Virology
  • Molecular Diagnostics
  • Public Health

Background:

  • Global shortages of SARS-CoV-2 diagnostic reagents necessitate cost-effective testing solutions.
  • Pooled nucleic acid testing is a proven strategy for infectious disease detection.

Purpose of the Study:

  • To evaluate the reliability of pooling nasopharyngeal samples for SARS-CoV-2 detection.
  • To assess the feasibility of RNA extraction-free protocols in pooled testing.

Main Methods:

  • Pooling of five nasopharyngeal samples for SARS-CoV-2 molecular detection.
  • Comparison of automated and manual RNA extraction methods.
  • Analysis of cycle threshold (CT) variations in pooled samples.

Main Results:

  • Pooling 5 samples showed acceptable CT variations (1.0-4.5 units), minimizing false negatives.
  • Omitting RNA extraction led to unsatisfactory results with increased CT values and higher false-negative risk.

Conclusions:

  • Pooled nucleic acid testing of nasopharyngeal samples is a reliable and cost-effective alternative for SARS-CoV-2 diagnosis.
  • This strategy is particularly suitable for increasing COVID-19 detection capacity in developing countries.