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Administration for a booster shot. but on thursday, the fda and centers for disease control and prevention issued an unusual joint statement saying americans who have been fully vaccinated do not need a booster shot right now. meanwhile, theres growing concern that low vaccination rates across the u.s. could potentially wipe out much of the progress the nation has made in fighting the virus. cnns athena jones with the latest. >> reporter: americas covid-19 crisis isnt over. infection rates ris...