Is Higher Viral Load in SARS-CoV-2 Associated with Death?

Area of Science:

• Virology
• Infectious Diseases
• Clinical Medicine

Background:

• No established prognostic marker exists for COVID-19 patients requiring hospitalization.
• COVID-19 disease severity ranges from mild to critical, impacting patient outcomes.
• Accurate prognostic markers are crucial for effective patient management and resource allocation.

Purpose of the Study:

• To investigate the association between SARS-CoV-2 viral load and mortality in hospitalized COVID-19 patients.
• To determine if viral load can serve as a prognostic marker for COVID-19 severity and outcomes.
• To compare disease severity and patient outcomes based on viral load.

Main Methods:

• Retrospective cohort study of 875 patients hospitalized with COVID-19.
• SARS-CoV-2 viral load assessed via cycle threshold (Ct) values from nasopharyngeal swab RT-PCR.
• Disease severity categorized as mild, moderate, or severe; outcomes compared based on Ct values.

Main Results:

• A high viral load (Ct value < 25) was observed in 472 patients.
• High viral load was independently associated with increased mortality (OR: 2.93; 95% CI: 1.87-4.60; P < 0.0001).
• Disease severity correlated with hospitalization status: mild (non-hospitalized), moderate (ward), and severe (ICU).

Conclusions:

• Admission SARS-CoV-2 viral load is an independent predictor of mortality in hospitalized COVID-19 patients.
• Cycle threshold (Ct) values can potentially serve as a prognostic marker for COVID-19.
• Further research is warranted to validate viral load as a routine prognostic tool.