School testing data were provided by Shield Illinois (ShieldIL), which conducted weekly in-school testing on behalf of the Illinois Department of Public Health (IDPH) for all participating schools in the state excluding Chicago Public Schools. The populations and proportions of students and employees in the studied school districts are reported by Elementary/Secondary Information System (ElSi) database.
Date made availableOct 16 2024
PublisherUniversity of Illinois Urbana-Champaign


  • COVID-19
  • school testing

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