Saliva as a Candidate for COVID-19 Diagnostic Testing: A Meta-Analysis

Area of Science:

• Virology
• Diagnostic Medicine
• Public Health

Background:

• COVID-19 diagnosis is critical for disease control.
• Nasopharyngeal swabs are the current standard but can be invasive.
• Saliva testing presents a simpler, potentially faster alternative for SARS-CoV-2 detection.

Approach:

• A meta-analysis was conducted on studies evaluating SARS-CoV-2 RNA detection in saliva.
• Searched multiple databases for eligible studies published between January 1 and April 25, 2020.
• Calculated pooled sensitivity and assessed heterogeneity for saliva and nasopharyngeal swab tests.

Key Points:

• Saliva tests demonstrated 91% sensitivity (CI 80-99%) for detecting SARS-CoV-2.
• Nasopharyngeal swab tests showed 98% sensitivity (CI 89-100%).
• Moderate heterogeneity was observed among the included studies.

Conclusions:

• Saliva-based testing is a viable alternative to nasopharyngeal swabs for COVID-19 diagnosis.
• Further studies are required to optimize the specificity and sensitivity of saliva tests.
• 18 ongoing clinical trials suggest continued interest in saliva-based diagnostics.