Fig. 3From: COVID-19 surveillance in the Flemish school system: development of systematic data collection within the public health school system and descriptive analysis of cases reported between October 2020 and June 2021Evolution of the distribution of the percentage of reported COVID-19 cases in school children by grade. Pre-school: age 2.5-5yo, grade 1-2: 6&7 yo, grade 3-4: 8&9 yo; grade 5-6: 10&11 yo; grade 7-8: 12&13 yo; grade 9-10: 14&15yo; grade 11-12: 16&17yo; yo: years old, intended age of pupils on January 1th while in the corresponding gradeBack to article page