American Covid: An Econometric Analysis of Variants.
McIntosh, J.
Show abstract
Covid-19 time series data on new cases from the United States for the period January 20, 2020 to February 7, 2022 is analyzed using a distributed lag econometric model applied to the Wild Type, Alpha, and Delta variants to determine the relative efficacy of vaccines and previous infection induced immunity. The results from this study confirm, for the most part, what others have found using large cross section samples: vaccines are effective in dealing with all three variants, more so with Delta. Infection induced immunity is always greater than or equal that delivered by a vaccination and is largest for the Delta variant. However, in the Delta case previous non-Delta infections had no prophylactic value in preventing new Delta infections.
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