Hidden Outbreak of COVID-19 in a Nursery School Among the Children's Family Members and Nursery Workers

Affiliations

• ¹ Field Epidemiology Training Program, National Institute of Infectious Diseases, Tokyo, Japan.
• ² Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Tokyo, Japan.
• ³ Center for Field Epidemiology Intelligence, Research, and Professional Development, National Institute of Infectious Diseases, Tokyo, Japan.
• ⁴ Asahikawa City Public Health Office, Hokkaido, Japan.
• ⁵ Hokkaido Government Department of Health and Welfare, Hokkaido, Japan.
• ⁶ Hokkaido Institute of Public Health, Hokkaido, Japan.
• ⁷ Center for Surveillance, Immunization and Epidemiologic Research, National Institute of Infectious Diseases, Tokyo, Japan.