Relation between IPC measures implementation and prevalence of anti-SARS-CoV-2 antibodies among pupils and staff 
Figure Prevalence of anti-SARS-CoV-2 antibodies according to the degree of IPC measure implementationData collected at December 2020/January 2021 in Belgian schools among pupils and staff. The black lines indicate the upper and lower 95% confidence intervals. When this analysis was repeated for each subcategory of measures (Fig. Prevalence of anti-SARS-CoV-2 antibodies according to the degree of subcategory IPC measures implementation. Data collected at December 2020/January 2021 in Belgian schools among pupils and staff. The black lines indicate the upper and lower 95% confidence intervals. 