Fig. 1: Timeline of Key COVID-19 mitigation policy change milestones in Massachusetts elementary and secondary schools, 2021–2022 academic Year. | Communications Medicine

Fig. 1: Timeline of Key COVID-19 mitigation policy change milestones in Massachusetts elementary and secondary schools, 2021–2022 academic Year.

From: Impacts of testing and immunity acquired through vaccination and infection on covid-19 cases in Massachusetts elementary and secondary students

Fig. 1

Key infection mitigation measure policies in Massachusetts elementary and secondary schools throughout the 2021–2022 academic year. Dates and dotted lines indicate date of policy or program implementation or change. Total duration of the policy is indicated with red arrows. Dominant variant is indicated with green arrows.

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