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SARS-CoV-2 viral load assessment in respiratory samples
Steven Kleiboeker1, Scott Cowden1, James Grantham1
1Viracor Eurofins Clinical Diagnostics, Lee's Summit, MO 64086, USA.
Summary
Real-time reverse transcriptase polymerase chain reaction (rRTPCR) testing diagnosed SARS-CoV-2, with a 14.9% positivity rate. Viral load assessment is crucial for understanding transmission and infection severity.
Area of Science:
- Virology
- Infectious Diseases
- Molecular Diagnostics
Background:
- Real-time reverse transcriptase polymerase chain reaction (rRTPCR) was the primary diagnostic method for SARS-CoV-2 during the COVID-19 pandemic.
- Understanding SARS-CoV-2 positivity rates and viral load characteristics is essential for public health management.
Purpose of the Study:
- To analyze SARS-CoV-2 positivity rates and viral load data from respiratory samples.
- To investigate demographic and clinical factors influencing SARS-CoV-2 detection and viral load.
Main Methods:
- Retrospective analysis of de-identified upper and lower respiratory samples tested via rRTPCR.
- Statistical analysis of positivity rates, viral loads (log10 copies/mL), and demographic data (birth year cohort, sex).
Main Results:
- A positivity rate of 14.9% (4428/29,713) was observed.
- Higher positivity rates were noted in individuals born between 1964-1974.
- Female patients exhibited significantly lower positivity rates (P < 0.0001) but similar viral loads compared to males.
- 15.3% of positive cases had viral loads > 8 log10 copies/mL, with some exceeding 10 log10 copies/mL.
Conclusions:
- Quantitative assessment of SARS-CoV-2 viral load provides valuable insights.
- Findings support the utility of viral load measurement in patient testing and transmission control strategies.
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