In March 2021, when Americans first began hearing about the Delta variant of Covid-19, breakthrough infections among fully-vaccinated Angelenos accounted for just 2% of that month’s case total.
By June, when Delta accounted for 50% of all variants in Los Angeles, breakthrough infections among fully-vaccinated residents had risen to 20% of all identified cases.
In late July, county officials reported that the Delta variant had overwhelmed all others, accounting for more than 90% of all positive tests analyzed for variants.
As a result, the ratio of breakthrough cases increased to 30%, local health officials announced today.While L.A. County numbers for the Delta variant have not been reported for August, as of August 21 Delta had risen to
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