Implementation of a pooled surveillance testing program for asymptomatic SARS-CoV-2 infections in K-12 schools and universities

Rachelle P. Mendoza, Chongfeng Bi, Hui Ting Cheng, Elmer Gabutan, Guillerre Jan Pagapas, Nadia Khan, Helen Hoxie, Stephen Hanna, Kelly Holmes, Nicholas Gao, Raychel Lewis, Huaien Wang, Daniel Neumann, Angela Chan, Meril Takizawa, James Lowe, Xiao Chen, Brianna Kelly, Aneeza Asif, Keena BarnesNusrat Khan, Brandon May, Tasnim Chowdhury, Gabriella Pollonini, Nourelhoda Gouda, Chante Guy, Candice Gordon, Nana Ayoluwa, Elvin Colon, Noah Miller-Medzon, Shanique Jones, Rauful Hossain, Arabia Dodson, Meimei Weng, Miranda McGaskey, Ana Vasileva, Andrew E. Lincoln, Robby Sikka, Anne L. Wyllie, Ethan M. Berke, Jenny Libien, Matthew Pincus, Prem K. Premsrirut

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Background: The negative impact of continued school closures during the height of the COVID-19 pandemic warrants the establishment of cost-effective strategies for surveillance and screening to safely reopen and monitor for potential in-school transmission. Here, we present a novel approach to increase the availability of repetitive and routine COVID-19 testing that may ultimately reduce the overall viral burden in the community. Methods: We implemented a testing program using the SalivaClear࣪ pooled surveillance method that included students, faculty and staff from K-12 schools (student age range 5–18 years) and universities (student age range >18 years) across the country (Mirimus Clinical Labs, Brooklyn, NY). The data analysis was performed using descriptive statistics, kappa agreement, and outlier detection analysis. Findings: From August 27, 2020 until January 13, 2021, 253,406 saliva specimens were self-collected from students, faculty and staff from 93 K-12 schools and 18 universities. Pool sizes of up to 24 samples were tested over a 20-week period. Pooled testing did not significantly alter the sensitivity of the molecular assay in terms of both qualitative (100% detection rate on both pooled and individual samples) and quantitative (comparable cycle threshold (Ct) values between pooled and individual samples) measures. The detection of SARS-CoV-2 in saliva was comparable to the nasopharyngeal swab. Pooling samples substantially reduced the costs associated with PCR testing and allowed schools to rapidly assess transmission and adjust prevention protocols as necessary. In one instance, in-school transmission of the virus was determined within the main office and led to review and revision of heating, ventilating and air-conditioning systems. Interpretation: By establishing low-cost, weekly testing of students and faculty, pooled saliva analysis for the presence of SARS-CoV-2 enabled schools to determine whether transmission had occurred, make data-driven decisions, and adjust safety protocols. We provide strong evidence that pooled testing may be a fundamental component to the reopening of schools by minimizing the risk of in-school transmission among students and faculty. Funding: Skoll Foundation generously provided funding to Mobilizing Foundation and Mirimus for these studies.

Original languageEnglish
Article number101028
JournaleClinicalMedicine
Volume38
DOIs
StatePublished - Aug 2021
Externally publishedYes

Keywords

  • Asymptomatic infections
  • K-12 schools
  • Pooled surveillance testing
  • SARS-CoV-2

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