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“The data we have tells us that protection against SARS-CoV-2 infection begins to decline over time after the first doses of the vaccine and we are seeing reduced protection with the spread of the Delta variant. So we concluded that a booster injection will be needed to maximize vaccine-induced protection and extend its shelf life, “is the decision signed by eight health authorities, including Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC) and Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases.
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