![]() Herlihy said in the last few weeks “the proportion of cases occurring among vaccinated people has grown a little bit more than we've expected and is now closer to that 80% vaccine effectiveness range.” She said that increase could be linked to the Delta strain, but cautioned that this analysis is a “crude estimation," not from a controlled study, so it needed to be interpreted carefully. ![]() That analysis had data from only 24 states and not Colorado, but Colorado’s three percent rate of breakthrough cases since Jan. A recent report from the Kaiser Family Foundation found the reported share of COVID-19 cases among those not fully vaccinated ranged from 94.1 percent in Arizona to 99.85 percent in Connecticut. But the 20 percent breakthrough figure also comes as an unexplained surprise and far exceeds anything seen throughout the pandemic, in Colorado or other states reporting their breakthrough case numbers. 1 mean fewer than one quarter of one percent of the more than three million fully vaccinated Coloradans later tested positive for COVID-19. The 5,818 recorded breakthrough cases since Jan. Most importantly, we have a highly effective tool to combat it.”īreakthrough cases and the Delta variant Hart Van Denburg/CPR News Christy Harmon, left, and Barbara Maurath prepare vaccine doses at Shorter Community African Methodist Episcopal Church in Denver, on Sunday, Feb. “I know we're all very tired of this virus. “There's increasing evidence that despite being vaccinated, you can still spread the virus, even though you yourself might not have symptoms, and so you might spread it to others who are unvaccinated, who could then have very severe symptoms,” Polis said, urging Coloradans to get vaccinated. Those three weeks accounted for more than 35 percent of the breakthrough cases recorded in the state since the start of the year. 1, the so-called “breakthrough cases,” or infections among people previously fully vaccinated, were 20 percent of all identified cases in the first three weeks of July in the state. While still making up just three percent of all COVID-19 infections in the state since Jan. Jared Polis to ask federal authorities to speed authorization of a booster shot for older adults. The percentage of COVID-19 infections among fully vaccinated Coloradans grew sharply in July, prompting Gov. ![]()
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