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Colorado county hit early by COVID-19 delta strain saw more breakthrough cases, CDC says
Morbidity and Mortality Weekly Report. In the report, released on Aug. 6, the CDC compiled data collected by the Colorado Department of Public Health and Environment to identify some of the earliest cases of the delta variant of the COVID-19 virus in the country. In May of this year, Mesa County, which has a population of 154,933, reported its first five cases of the delta variant, all of which "were associated with school settings," according to the CDC. Mesa County’s delta variant case count more than doubled from 43% to 88% between May 1 to June 5.