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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, there's 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. cnn's athena jones with the latest. >> reporter: america's covid-19 crisis isn't over. infection rates rising in almost half the states, driven in part by the more contagious delta variant. low vaccination rates putting the country's progress fighting the virus at risk. >> the more unvaccinated people there are, the longer this pandemic is going to be. this is not just about the individual. this is about our society. >> reporter: a georgetown university analysis showing five clusters of counties with low vaccination rates and significant population sizes,