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@kallmemeg An academic effort gives good data on behavior in the USA, including an ability to answer "How many unvaccinated people wear masks?", which captures 45,000 Americans daily. delphi.cmu.edu/covidcast/survey-results/
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@kallmemeg There is country-level YouGov survey data for the UK and around 30 other countries here: github.com/YouGov-Data/covid-19-tracker