SARS-CoV-2 Infection in School Settings, Okinawa Prefecture, Japan, 2021-2022.

Area of Science:

• Epidemiology
• Public Health
• Infectious Diseases

Background:

• Widespread school closures occurred globally during the COVID-19 pandemic.
• These closures were based on the assumption of frequent SARS-CoV-2 transmission among children in educational settings.
• Limited data exists on secondary infection rates within schools, varying by school type and contact levels.

Purpose of the Study:

• To estimate the frequency of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in school settings.
• To analyze positivity rates based on school type and level of contact.
• To provide evidence for balancing public health interventions with educational impacts.

Main Methods:

• Utilized data from a large-scale, school-based Polymerase Chain Reaction (PCR) project in Okinawa, Japan.
• Conducted between 2021 and 2022.
• Examined SARS-CoV-2 positivity rates stratified by school type and contact intensity.

Main Results:

• Numerous positive cases of SARS-CoV-2 were detected within the school settings.
• The average number of secondary infections per positive case was low, approximately 0.5 across all school types.
• Findings suggest limited transmission occurred within the school environment.

Conclusions:

• The assumption of common SARS-CoV-2 transmission in schools may not be fully supported by the data.
• The study highlights the need to weigh the public health benefits of school closures against their significant negative impacts on children's education.
• A balanced approach is crucial when considering school policies during pandemics.