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Deterred. with the tsa screening around 2 million or more people a day for the past six days. the cdc director reminding travelers -- >> how safe your holiday is is really about how safe you are in the time leading up to the holiday. >> reporter: and as israel considers rolling out a fourth dose of pfizers covid-19 vaccine, for medical workers, the immunocompromised, and people over 60, u.s. health officials say they will follow the science. >> right now we feel confident that if you have a boos...