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television. who are those people? we know those people actually. >> we do. >> welcome to our viewers, it's wednesday, july 21st. tens of millions of americans are in graver danger than ever as covid is surging across the country. cases in the hospital are spiking by an alarming case fueled by the delta variant and the determination by millions of americans to not get vaccinated. this delta variant now accounts for 83% of all u.s. covid cases. nearly 73 million americans live in a county that is deemed to have high virus transmission. the states with the lowest vaccination rates are seeing the sharpest increase in new cases. breakthrough cases on the rise, too. we are very concerned about that. we're going to talk about that a lot today. cdc director rochelle walensky says the vaccine work because they reduce the severity of the disease. >> the message from cdc remains clear. the best way to prevent the spread of covid-19 variants is to prevent the spread of disease