Vaccines are less protective against Delta infection but still reduce risk by two-thirds, CDC study shows
By Michael Nedelman, Eric Levenson and Madeline Holcombe, CNN Vaccine effectiveness against Covid-19 infection dropped from 91% to 66% once the Delta variant accounted for the majority of circulating virus, according to a study published Tuesday by the US Centers for Disease Control and Prevention. “While we did see a reduction in the protection of
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