Pooling-in-a-pod: A Strategy for COVID-19 Testing to Facilitate Safe Return to School

The COVID-19 pandemic has prompted widespread primary and secondary school closures. Routine testing of asymptomatic students and staff, as part of a comprehensive program, can help schools open safely. "Pooling-in-a-pod" is a public health surveillance strategy whereby testing cohorts are composed based on social relationships and physical proximity. Pooling-in-a-pod allowed for weekly on-site point-of-care testing of all staff and students at an independent preschool to grade 12 school in Washington, D.C. Staff and older students self-collected anterior nares samples, and trained staff collected samples from younger students. Overall, 6,746 samples were tested for 815 students and 276 staff between November 30, 2020, and March 3, 2021. The average pool size was 7.3 people. Sample collection to pool result time averaged 40 minutes. The direct testing cost per person per week was $24.77, including swabs. One surveillance test pool was positive. During the study period, daily new cases in Washington, D.C., ranged from 24 - 46 per 100,000 population. A post-launch survey found most parents (90.3%), students (93.4%), and staff (98.8%) were willing to participate in pooled testing with confirmatory tests for positive pool members. The school reported a 32.6% decrease in virtual learning after initiation of the program. Pooling-in-a-pod is feasible, cost-effective, and an acceptable COVID-19 surveillance strategy for schools. School officials and policymakers can leverage this strategy to facilitate safe, sustainable, in-person schooling.