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Fig 6 shows the US confirmed cases and deaths against the % of delta variant of the virus. There is a noticeable uptick in cases somewhere between 40% and 65% delta variant. If one takes the first US reported Delta Variant (from https://www.gisaid.org/hcov19-variants/ - the GSAID initiative is an online database where scientists share genetic analyses of viral samples) of 0.1% on 4/11/21 to the 60.19% for N America reported for 7/5/21 by https://www.gisaid.org/hcov19-variants/ then it took 85 days to go from 0.1% of cases to over 61% cases and 16 more days to get to 83% of cases being the delta variant.
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