Pooling for SARS-CoV2 Surveillance: Validation and Strategy for Implementation in K-12 Schools.

Monitoring viral spread is vital for reopening schools safely. Traditional RT-PCR testing is accurate but costly when applied to large groups. This gap motivated exploring cost-effective alternatives. Prior research has shown individual testing remains the gold standard. However, financial constraints limit widespread use. Pooling samples could reduce costs but requires validation. No prior work had resolved the impact of pooling on test accuracy. This study aimed to address that uncertainty. It tested whether pooled samples maintain diagnostic accuracy.

The goal was to assess if pooled RT-PCR testing maintains diagnostic accuracy. The specific problem is high testing costs for K-12 schools. The motivation is to enable frequent testing without financial strain. The authors propose that pooling could reduce expenses. They wanted to confirm if pooled samples retain sensitivity and specificity. The study focused on a low-prevalence setting. It tested whether pooling eight samples affects results. The approach was to compare pooled and individual tests in real-world conditions.

Researchers recruited 1,576 participants from Tufts University. Each participant provided two swabs: one for individual testing and one for pooling. Pools contained samples from eight individuals. Due to low positivity rates, half the pools were spiked with known positives. The CDC RT-PCR assay targeted two nucleocapsid gene regions. Swabs were processed using standard protocols. Test results were compared between pooled and individual samples. The study used a controlled design to assess diagnostic accuracy.

Pooled tests showed 100% agreement with individual test results. No false negatives or positives were observed in pooled samples. The low positivity rate did not affect the study's conclusions. Spiked pools confirmed the method's reliability. The RT-PCR assay maintained full sensitivity and specificity. Pooling eight samples did not compromise diagnostic accuracy. Results suggest pooled testing is viable for surveillance. The method proved effective in a real-world setting.

The authors suggest pooled testing is a viable strategy for institutions. They propose that pooling eight samples does not reduce diagnostic accuracy. The study supports using pooled RT-PCR for cost-effective surveillance. The findings align with the need for affordable testing solutions. The method could help schools reduce testing expenses. It maintains diagnostic reliability in low-prevalence settings. The authors recommend further implementation studies. They emphasize the importance of validating cost-saving approaches.