County hit early by Delta variant had more breakthrough cases:
© 2020 Bloomberg Finance LPA study of Covid-19 cases from April into June found that breakthrough infections of vaccinated people were more common in Mesa County, Colorado, where the delta variant was more dominant than it was in the rest of the state.
Researchers estimated that the vaccine’s effectiveness was 78% in Mesa County, compared to 89% in other Colorado counties where delta was less prominent.The delta variant became the dominant strain of Covid-19 in Mesa County within five weeks of the first known case.
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