In late April 2020, scientists at the Institut Pasteur, with the support of the Hauts-de-France Regional Health Agency and the Amiens Education Authority, carried out an epidemiological survey on 1,340 people linked to primary schools in Crépy-en-Valois, in the Oise department. Thanks to the cooperation of the people of Crépy-en-Valois, the survey, which made use of serological tests developed by the Institut Pasteur, revealed that the proportion of primary school students infected by the novel coronavirus was 8.8%. Based on some cases of infection detected in the students before the schools closed, it appears that the children did not spread the infection to other students or to teachers or other staff at the schools. The results were published online on pasteur.fr on June 23, 2020.? The results were then published on April 15th, 2021 on Eurosurveillance.

https://www.pasteur.fr/en/press-area/press-documents/covid-19-primary-schools-no-significant-transmission-among-children-students-teachers