Viral load and disease severity in COVID-19
Rahul Dnyaneshwar Pawar1,2, Lakshman Balaji3, Shivani Mehta3
1Division of Hospital Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, 1 Deaconess Road, Boston, MA, 02215, USA. rpawar@bidmc.harvard.edu.
Internal and Emergency Medicine
|June 16, 2021
Summary
This study found no clear association between SARS-CoV-2 viral load and COVID-19 severity in patients. While viral load was higher in non-intubated ICU patients, other severity metrics showed no significant viral load differences.
Area of Science:
- Infectious Diseases
- Virology
- Critical Care Medicine
Background:
- The relationship between SARS-CoV-2 viral load and COVID-19 severity remains unclear.
- Understanding this association is crucial for patient management and prognosis.
Purpose of the Study:
- To investigate the association between SARS-CoV-2 viral load and disease severity in hospitalized adult patients.
- To compare viral load across different levels of care and clinical severity scores.
Main Methods:
- Single-center observational study of 396 laboratory-confirmed SARS-CoV-2 adult patients.
- Viral load quantified as log10 copies/ml from nasopharyngeal swabs.
- Severity assessed by level of care and modified Sequential Organ Failure Assessment (mSOFA) score.
Main Results:
- Median SARS-CoV-2 log10 copy number (CN) was 5.5 (IQR 3.3-8.0).
- Viral load was significantly higher in non-intubated ICU patients compared to intubated ICU patients (p < 0.01).
- No significant association found between viral load and mSOFA scores, influenza vaccination status, or D-dimer levels.
Conclusions:
- In this cohort, a clear association between SARS-CoV-2 viral load and overall COVID-19 disease severity was not established.
- Higher viral load in non-intubated ICU patients warrants further investigation, but other severity indicators did not correlate with viral load.
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