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CDC Sheds Light on Breakthrough COVID Infections

email article Breakthrough infections following COVID-19 vaccination were rare, most were mild, and the majority of those sequenced came from variant strains of the virus, CDC researchers found. Of the 5% of cases sequenced, 64% were identified as variants of concern, such as the U.K. and California variant strains (B.1.1.7 and B.1.429, respectively), according to Marc Fischer, MD, and colleagues from the CDC COVID-19 Vaccine Breakthrough Case Investigations Team, writing in an early edition of the The team emphasized that more than 101 million people were vaccinated against COVID-19 from Jan. 1 to April 30, 2021, but breakthrough cases are expected, especially before population immunity reaches sufficient levels to further decrease transmission.

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