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. 2021 Oct 11;40(11):955–961. doi: 10.1097/INF.0000000000003279

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Copyright © 2021 The Author(s). Published by Wolters Kluwer Health, Inc.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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FIGURE 3. — Distribution of daily new cases by age. A: Dependence of the fraction of index cases without secondary cases on the educational level. B: Fraction of students infected inside and outside of the bubble group, assuming no simultaneous infections by different index cases. C: Total number of cases and index cases for different educational level. D: Percentage of students infected during the 3 months (as reference for Catalonia 3% of the population were infected), percentage of case indexes, and percentage of secondary cases.