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- US Daily COVID-19 Confirmed cases have increased by over a factor of 3 in the 3 weeks between July 1 and July 21st.
- The US % of cases that are the more contagious Delta variant of COVID-19 was first noticed (0.1% cases) in mid-April 2013 and has increased roughly exponentially with time until by July 21st it was over 83% of the cases.
- The impact of the delta variant on an increase in cases and deaths was hardly noticeable until the delta variant cases exceeded 60%.
- The fraction of the variability of the dependent variable (Y = COVID-19 confirmed cases on 7/22/2021) that is explained by the independent variable (X = Fraction of the US state's fully vaccinated population) is ~ 37% (the R2 correlation factor)
- States that voted in 2020 for Trump (red states), in general, have lower vaccination fractions (0.42+-0.05) vs Biden blue states (0.54+-0.06), and states that voted for Trump have higher COVID-19 confirmed cases (174+-121) than states that voted for Biden (85+-62).
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Also see https://www.cdc.gov/media/releases/2021/p0329-COVID-19-Vaccines.html and https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/fully-vaccinated-people.html