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Percentage change in monthly absolute search volumes for varicella keywords, March 2020 through December 2021, compared with average search volumes during respective months in 2018 and 2019 in countries A) without UVV and B) with UVV. Percentage change was calculated by comparing the monthly search volumes recorded from March 2020 to December 2021, with the 2-year average of search volumes recorded during respective months in 2018 and 2019.
