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It's a move the agency said was driven by scientific evidence that the vaccines play a major role in curbing both infections and transmission of the virus.In announcing the agency's updated guidelines, CDC Director Dr. Rochelle Walensky said there are "numerous reports in the literature" to demonstrate the safety and real-world effectiveness of Covid-19 vaccines.Full coverage of the coronavirus outbreakWalensky highlighted, in particular, three recent studies that demonstrated the impact of the vaccines on symptomatic and asymptomatic infections and one study published just last week on the effectiveness of Covid-19 vaccines against two variants that are known to be circulating in the United States.The findings all add to a growing body of evidence that the vaccines are effective at preventing severe illness and death from Covid-19 and that they help prevent people from spreading the virus to others."The trends are all going down because vaccines are making a big difference," said Dr. Isaac Weisfuse, a medical epidemiologist at Cornell University and former New York City deputy health commissioner.
As said here by Denise Chow