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Vaccine protection against Covid-19 wanes over time, especially for older people, CDC says
By Maggie Fox and Jamie Gumbrecht, CNN The protection provided by Covid-19 vaccines appears to wane over time, especially for people 65 and older, a US Centers for Disease Control and Prevention expert said Wednesday. Ruth Link-Gelles, who helps lead the CDC’s Vaccine Effectiveness Team, reviewed a series of studies looking at the overall effectiveness
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