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. 2022 Jan 25;12(1):e055968. doi: 10.1136/bmjopen-2021-055968

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Cumulative coverage for MMR/MMRV vaccine for children who turned 13 months (A) in March 2019 and March 2020 and (B) in April 2019 and April 2020 in Alberta, Canada. The 2019 cohorts were followed until March 2020 and the 2020 cohorts were followed until March 2021. Bars represent 95% CIs. MMR, measles-mumps-rubella; MMRV, measles-mumps-rubella-varicella.